Fix container networking: Use container IP for health checks

Root Cause Identified:
- Gitea runner runs inside docker.gitea.com/runner-images:ubuntu-latest
- App container runs as sibling container, not accessible via localhost:8080
- Port mapping works for host access, but not container-to-container

 Networking Solution:
- Get container IP with: docker inspect ping-river-monitor-test
- Connect directly to container IP:8000 (internal port)
- Fallback to localhost:8080 if IP detection fails
- Bypasses localhost networking issues in containerized CI

 Updated Health Checks:
- Use container IP for direct communication
- Test internal port 8000 instead of mapped port 8080
- More reliable in containerized CI environments
- Better debugging with container IP logging

 Should resolve curl connection failures in Gitea CI environment

.gitea/workflows/release.yml

@@ -218,23 +218,74 @@ jobs:
           echo "📋 Recent container logs:"
           docker logs --tail 10 ping-river-monitor-test || true
 
-          # Wait for the application to be ready
+          # Wait for the application to be ready with more robust checking
-          for i in {1..12}; do
+          echo "🔍 Testing application readiness..."
-            if curl -f http://127.0.0.1:8080/health; then
+          for i in {1..15}; do
-              echo "✅ Health endpoint responding"
+            echo "⏳ Attempt $i/15: Testing health endpoint..."
+            
+            # Test health endpoint with container networking
+            echo "Testing health endpoint..."
+            
+            # Get the container's IP address for direct communication
+            CONTAINER_IP=$(docker inspect -f '{{range .NetworkSettings.Networks}}{{.IPAddress}}{{end}}' ping-river-monitor-test)
+            echo "Container IP: $CONTAINER_IP"
+            
+            # Test using container IP directly (port 8000 inside container)
+            if [ -n "$CONTAINER_IP" ]; then
+              response=$(curl -s --max-time 10 --connect-timeout 5 -w "HTTP_CODE:%{http_code}" http://$CONTAINER_IP:8000/health)
+            else
+              # Fallback to localhost if IP detection fails
+              response=$(curl -s --max-time 10 --connect-timeout 5 -w "HTTP_CODE:%{http_code}" http://127.0.0.1:8080/health)
+            fi
+            
+            http_code=$(echo "$response" | grep -o "HTTP_CODE:[0-9]*" | cut -d: -f2)
+            response_body=$(echo "$response" | sed 's/HTTP_CODE:[0-9]*$//')
+            
+            echo "HTTP Code: $http_code"
+            echo "Response Body: $response_body"
+            
+            if [ "$http_code" = "200" ] && [ -n "$response_body" ]; then
+              echo "✅ Health endpoint responding successfully!"
               break
             else
-              echo "⏳ Waiting for health endpoint... (attempt $i/12)"
+              echo "❌ Health check failed (HTTP: $http_code), waiting 15 seconds..."
-              sleep 10
+              # Show what's happening with the container
+              echo "Container status:"
+              docker ps | grep ping-river-monitor-test || echo "Container not found"
+              echo "Recent container logs:"
+              docker logs --tail 5 ping-river-monitor-test || true
+              sleep 15
             fi
           done
 
-          # Test API endpoints
+          # Test API endpoints with container networking
           echo "🧪 Testing API endpoints..."
-          curl -f http://127.0.0.1:8080/health || exit 1
+          
-          curl -f http://127.0.0.1:8080/docs || exit 1
+          # Get container IP for direct communication
-          curl -f http://127.0.0.1:8080/stations || exit 1
+          CONTAINER_IP=$(docker inspect -f '{{range .NetworkSettings.Networks}}{{.IPAddress}}{{end}}' ping-river-monitor-test)
-          curl -f http://127.0.0.1:8080/metrics || exit 1
+          echo "Using container IP: $CONTAINER_IP"
+          
+          endpoints=("health" "docs" "stations" "metrics")
+          for endpoint in "${endpoints[@]}"; do
+            echo "Testing /$endpoint..."
+            
+            # Use container IP if available, otherwise fallback to localhost
+            if [ -n "$CONTAINER_IP" ]; then
+              response=$(curl -s --max-time 10 -w "HTTP_CODE:%{http_code}" http://$CONTAINER_IP:8000/$endpoint)
+            else
+              response=$(curl -s --max-time 10 -w "HTTP_CODE:%{http_code}" http://127.0.0.1:8080/$endpoint)
+            fi
+            
+            http_code=$(echo "$response" | grep -o "HTTP_CODE:[0-9]*" | cut -d: -f2)
+            
+            if [ "$http_code" = "200" ]; then
+              echo "✅ /$endpoint: OK (HTTP $http_code)"
+            else
+              echo "❌ /$endpoint: FAILED (HTTP $http_code)"
+              echo "Response: $(echo "$response" | sed 's/HTTP_CODE:[0-9]*$//')"
+              exit 1
+            fi
+          done
 
           echo "✅ All health checks passed!"