Product repository template

Layout, proplan.toml, README/CHANGELOG, placeholder product image, .gitignore, KiBot/release/docgen workflows and TEMPLATE.md. Source of truth: contrib/product-template in B4L/proplan (cargo test --test product_template checks it as Gitea 1.27 creates a repository from it).

.gitea/workflows/docgen.yml

@@ -0,0 +1,54 @@
+name: Fabrication document
+
+# With a docs/input.md (typecad-docgen front matter, as in PowerModule):
+# builds the fabrication document of the first board and pushes it to the
+# docu branch, so main stays free of generated files. Adapted from
+# LVSolarBuck and PowerModule.
+on:
+  push:
+    branches: [main]
+    paths:
+      - 'docs/input.md'
+      - 'hardware/**'
+      - '.gitea/workflows/docgen.yml'
+
+jobs:
+  docgen:
+    runs-on: kicad10_auto
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Inputs
+        id: inputs
+        run: |
+          pcb=$(find hardware -mindepth 2 -maxdepth 2 -name '*.kicad_pcb' | sort | head -1)
+          if [ -f docs/input.md ] && [ -n "$pcb" ]; then
+            echo "pcb=$pcb" >> "$GITHUB_OUTPUT"
+          else
+            echo "No docs/input.md or no board yet: nothing to build."
+          fi
+
+      - name: Build
+        if: steps.inputs.outputs.pcb != ''
+        run: |
+          mkdir -p output-docs
+          typecad-docgen docs/input.md "${{ steps.inputs.outputs.pcb }}" -o output-docs/index.html
+
+      - name: Push to the docu branch
+        if: steps.inputs.outputs.pcb != ''
+        env:
+          GITEA_TOKEN: ${{ secrets.GITEA_TOKEN }}
+        run: |
+          git config --global user.email "${{ gitea.actor }}@noreply.localhost"
+          git config --global user.name "${{ gitea.actor }}"
+          REPO_URL=$(git config --get remote.origin.url)
+          AUTHED_URL=${REPO_URL/https:\/\//https:\/\/${GITEA_TOKEN}@}
+          git clone --depth 1 --branch docu "$AUTHED_URL" docu || git clone --depth 1 "$AUTHED_URL" docu
+          cd docu
+          git checkout -B docu
+          git rm -rq . || true
+          cp -r ../output-docs/* .
+          git add -A
+          if git diff --cached --quiet; then echo "No changes"; exit 0; fi
+          git commit -m "chore: fabrication document"
+          git push --force "$AUTHED_URL" docu