🐛 fix: use inline Dockerfile instead of template to simplify build process

.gitea/workflows/docker-push.yaml

@@ -58,14 +58,51 @@ jobs:
           DEPS_HASH="${{ steps.calc_hash.outputs.deps_hash }}"
           echo "Using dependency hash: $DEPS_HASH"
           
-          # Create Dockerfile.prod from template
-          sed "s/{{DEPS_HASH}}/$DEPS_HASH/g" docker/Dockerfile.prod.template > docker/Dockerfile.prod
-          
           TAGS="$IMAGE_VERSION latest ${{ github.sha }}"
           echo "Building Docker image with tags: $TAGS"
           
-          # Build the production image
-          docker build -t dance-lessons-coach -f docker/Dockerfile.prod .
+          # Build the production image using inline Dockerfile
+          docker build -t dance-lessons-coach -f - . <<'EOF'
+          # dance-lessons-coach Production Docker Image
+          # Inline Dockerfile - no template needed
+          
+          # Use the build cache image as base
+          FROM gitea.arcodange.lab/arcodange/dance-lessons-coach-build-cache:${DEPS_HASH} AS builder
+          
+          # Set working directory and build the binary
+          WORKDIR /workspace
+          RUN go build -o dance-lessons-coach ./cmd/server
+          
+          # Final minimal image
+          FROM alpine:3.18
+          
+          WORKDIR /app
+          
+          # Install minimal dependencies
+          RUN apk add --no-cache ca-certificates tzdata
+          
+          # Copy binary from builder
+          COPY --from=builder /workspace/dance-lessons-coach /app/dance-lessons-coach
+          
+          # Copy configuration
+          COPY config.yaml /app/config.yaml
+          
+          # Set permissions
+          RUN chmod +x /app/dance-lessons-coach
+          
+          # Set timezone
+          ENV TZ=UTC
+          
+          # Expose port
+          EXPOSE 8080
+          
+          # Health check
+          HEALTHCHECK --interval=30s --timeout=3s \
+              CMD wget -q --spider http://localhost:8080/api/health || exit 1
+          
+          # Entry point
+          ENTRYPOINT ["/app/dance-lessons-coach"]
+          EOF
           
           for TAG in $TAGS; do
             IMAGE_NAME="${{ env.CI_REGISTRY }}/${{ env.GITEA_ORG }}/${{ env.GITEA_REPO }}:$TAG"