CI: run the suite on every platform the README now advertises

Gitea Actions matrix: ubuntu-latest (py3.11/3.13) plus Debian 12,
Ubuntu 24.04, Fedora and Arch containers, each installing the system
libraries PySide6 wheels dlopen - all four validated locally in
Docker (Debian 141/141, QtWidgets import probe green everywhere).
Windows/macOS and a NixOS-FHS job (tools/ci-fhs.nix, the library set
from docs/NIXOS.md) are gated to github.com runners so they skip
instead of queueing forever here. README gets a Platform support
table with the workflow badge; KiCad-in-the-loop stays field-tested,
CI covers the solver and fallback suite.

.gitea/workflows/ci.yml

@@ -0,0 +1,143 @@
+# Runs the full pytest suite (solver, raster, platform fallbacks)
+# against real pip wheels on every platform row advertised in the
+# README's "Platform support" table. What it cannot do is launch KiCad
+# itself — the plugin-inside-KiCad integration stays field-tested.
+#
+# Gitea/Forgejo Actions syntax is GitHub-Actions-compatible; if the
+# repo is ever mirrored to github.com, copy this file to
+# .github/workflows/ (GitHub does not read .gitea/). The
+# windows/macos and NixOS jobs need runners that only github.com
+# provides for free, so they are gated on the server URL instead of
+# queueing forever on a self-hosted instance; drop the `if:` lines if
+# you register your own runners with those labels.
+# Third-party actions pinned to commit SHAs, matching build-pcm.yml:
+# mutable tags could be repointed at malicious code.
+name: tests
+
+on:
+  push:
+    branches: [main]
+  pull_request:
+  workflow_dispatch:
+
+env:
+  UV_PYTHON: "3.12"
+  # No test opens a window, but if one ever creates a figure the Qt
+  # backend must not try to reach a display on a headless runner.
+  QT_QPA_PLATFORM: offscreen
+
+jobs:
+  linux:
+    name: ubuntu-latest · py${{ matrix.python }}
+    runs-on: ubuntu-latest
+    strategy:
+      fail-fast: false
+      matrix:
+        python: ["3.11", "3.13"]
+    env:
+      UV_PYTHON: ${{ matrix.python }}
+    steps:
+      - uses: actions/checkout@34e114876b0b11c390a56381ad16ebd13914f8d5 # v4
+      - name: Qt runtime libraries (PySide6 wheels dlopen these)
+        run: >
+          sudo apt-get update -qq && sudo apt-get install -y -qq
+          libglib2.0-0 libgl1 libegl1 libopengl0 libfontconfig1
+          libfreetype6 libdbus-1-3 libxkbcommon0 libzstd1 libxcb1
+          libx11-6 libxext6 libxrender1 libsm6 libice6
+      - uses: astral-sh/setup-uv@d4b2f3b6ecc6e67c4457f6d3e41ec42d3d0fcb86 # v5.4.2
+      - run: uv sync --frozen
+      - run: uv run python -c "import PySide6.QtWidgets"
+      - run: uv run pytest -q
+
+  distros:
+    name: ${{ matrix.distro }}
+    runs-on: ubuntu-latest
+    container: ${{ matrix.distro }}
+    strategy:
+      fail-fast: false
+      matrix:
+        include:
+          - distro: debian:12
+            setup: >
+              apt-get update -qq && apt-get install -y -qq
+              curl ca-certificates
+              libglib2.0-0 libgl1 libegl1 libopengl0 libfontconfig1
+              libfreetype6 libdbus-1-3 libxkbcommon0 libzstd1 libxcb1
+              libx11-6 libxext6 libxrender1 libsm6 libice6
+          - distro: ubuntu:24.04
+            setup: >
+              apt-get update -qq && apt-get install -y -qq
+              curl ca-certificates
+              libglib2.0-0 libgl1 libegl1 libopengl0 libfontconfig1
+              libfreetype6 libdbus-1-3 libxkbcommon0 libzstd1 libxcb1
+              libx11-6 libxext6 libxrender1 libsm6 libice6
+          - distro: fedora:latest
+            setup: >
+              dnf install -y -q
+              glib2 mesa-libGL mesa-libEGL libglvnd-opengl fontconfig
+              freetype dbus-libs libxkbcommon libzstd libxcb libX11
+              libXext libXrender libSM libICE
+          - distro: archlinux:latest
+            setup: >
+              pacman -Syu --noconfirm --needed
+              curl glib2 libglvnd fontconfig freetype2 dbus
+              libxkbcommon zstd libxcb libx11 libxext libxrender
+              libsm libice
+    steps:
+      - uses: actions/checkout@34e114876b0b11c390a56381ad16ebd13914f8d5 # v4
+      - name: Distro Qt runtime libraries
+        run: ${{ matrix.setup }}
+      - name: Install uv
+        run: |
+          curl -LsSf https://astral.sh/uv/install.sh | sh
+          echo "$HOME/.local/bin" >> "$GITHUB_PATH"
+      - run: uv sync --frozen
+      - run: uv run python -c "import PySide6.QtWidgets"
+      - run: uv run pytest -q
+
+  desktop:
+    name: ${{ matrix.os }} · py${{ matrix.python }}
+    # github.com only: no free Windows/macOS runners on self-hosted
+    # Gitea/Forgejo. Skipped (not queued) elsewhere.
+    if: github.server_url == 'https://github.com'
+    runs-on: ${{ matrix.os }}
+    strategy:
+      fail-fast: false
+      matrix:
+        os: [windows-latest, macos-latest]
+        python: ["3.11", "3.13"]
+    env:
+      UV_PYTHON: ${{ matrix.python }}
+    steps:
+      - uses: actions/checkout@34e114876b0b11c390a56381ad16ebd13914f8d5 # v4
+      - uses: astral-sh/setup-uv@d4b2f3b6ecc6e67c4457f6d3e41ec42d3d0fcb86 # v5.4.2
+      - run: uv sync --frozen
+      - run: uv run python -c "import PySide6.QtWidgets"
+      - run: uv run pytest -q
+
+  nixos:
+    name: NixOS (FHS wrapper from docs/NIXOS.md)
+    # Needs unprivileged user namespaces for bubblewrap, which the
+    # GitHub ubuntu VM allows but a docker-based act_runner does not.
+    if: github.server_url == 'https://github.com'
+    runs-on: ubuntu-latest
+    continue-on-error: true
+    steps:
+      - uses: actions/checkout@34e114876b0b11c390a56381ad16ebd13914f8d5 # v4
+      - uses: DeterminateSystems/nix-installer-action@e50d5f73bfe71c2dd0aa4218de8f4afa59f8f81d # v16
+      - name: Build the FHS environment (docs/NIXOS.md library set)
+        run: nix-build tools/ci-fhs.nix -o ci-fhs
+      - name: Run the suite inside the FHS env
+        # shellcheck disable=SC2016 -- $HOME/$PATH expand inside the
+        # FHS bash, not the runner shell; single quotes are the point.
+        run: |
+          # shellcheck disable=SC2016
+          ./ci-fhs/bin/fill-resistance-ci -c '
+            set -e
+            curl -LsSf https://astral.sh/uv/install.sh | sh
+            export PATH="$HOME/.local/bin:$PATH"
+            export UV_PROJECT_ENVIRONMENT=/tmp/venv
+            uv sync --frozen
+            uv run python -c "import PySide6.QtWidgets"
+            uv run pytest -q
+          '

README.md

@@ -28,6 +28,27 @@ happens around the notch on F.Cu.*
 Uses the KiCad **IPC API** (`kicad-python` / `kipy`), not the deprecated
 SWIG API. Requires KiCad **10.0.1+**.
 
+## Platform support
+
+[![tests](https://git.b4l.co.th/B4L/kicad-zone-resistance/actions/workflows/ci.yml/badge.svg?branch=main)](https://git.b4l.co.th/B4L/kicad-zone-resistance/actions)
+
+| Platform                    | Status | Verified by |
+|-----------------------------|:------:|-------------|
+| Windows                     |   ✅   | development platform; CI test suite |
+| macOS                       |   ✅   | field-tested in KiCad 10; CI test suite |
+| NixOS                       |   ✅   | field-tested in KiCad 10 ([setup](docs/NIXOS.md)); CI runs the suite inside the documented FHS env |
+| Debian 12                   |   ✅   | CI test suite in container |
+| Ubuntu 24.04                |   ✅   | CI test suite in container |
+| Fedora (latest)             |   ✅   | CI test suite in container |
+| Arch (latest)               |   ✅   | CI test suite in container |
+
+CI (`.gitea/workflows/ci.yml`) runs the full pytest suite — solver,
+rasterizer, and the platform-fallback regressions — headless against
+the real pip wheels of each row, including the `PySide6.QtWidgets`
+import probe that decides the matplotlib backend. What CI *cannot* do
+is launch KiCad itself, so "runs inside KiCad" remains field-tested
+(Windows continuously, macOS and NixOS per release).
+
 ## Setup (one-time)
 
 The plugin is developed and tested on **Windows**; **macOS works**

tools/ci-fhs.nix

@@ -0,0 +1,25 @@
+# CI-only: the FHS environment from docs/NIXOS.md minus KiCad itself.
+# The suite runs against pip wheels exactly as the plugin's venv does
+# inside the wrapped KiCad: PySide6 dlopens these libraries at FHS
+# paths. Keep this library list in sync with the buildFHSEnv recipe in
+# docs/NIXOS.md — CI failing here means the documented recipe broke.
+{ pkgs ? import <nixpkgs> { } }:
+
+pkgs.buildFHSEnv {
+  name = "fill-resistance-ci";
+  targetPkgs = p: with p; [
+    bashInteractive curl cacert
+    glib fontconfig freetype dbus libGL libxkbcommon
+    xcb-util-cursor wayland zlib zstd.out
+    xorg.libX11 xorg.libxcb xorg.libXext xorg.libXrender
+    xorg.libSM xorg.libICE xorg.libXrandr xorg.libXi
+    xorg.libXcursor xorg.libXfixes
+    # xcb-util family needed by PySide6's bundled xcb platform plugin
+    xorg.xcbutil xorg.xcbutilwm xorg.xcbutilimage
+    xorg.xcbutilkeysyms xorg.xcbutilrenderutil
+  ];
+  # See docs/NIXOS.md failure layer 3: the desktop's QT_PLUGIN_PATH
+  # must not leak into the wheel's bundled Qt.
+  profile = "unset QT_PLUGIN_PATH";
+  runScript = "bash";
+}