Add firmware artifact collection and Gitea package publishing

- Upload firmware binaries as build artifacts (5-day retention)
- Add publish-packages job to collect, rename with timestamp, and publish to Gitea
- Firmware named as: board-<unix-timestamp>.bin
- Publishes to Gitea generic package registry only on main branch push
- Include package publishing in CI summary status check

.gitea/workflows/ci.yml

@@ -77,10 +77,52 @@ jobs:
       - name: Build ${{ matrix.target }}
         run: pio run -e ${{ matrix.target }}
 
+      - name: Upload firmware artifact
+        uses: actions/upload-artifact@v4
+        with:
+          name: firmware-${{ matrix.target }}
+          path: .pio/build/${{ matrix.target }}/firmware.bin
+          retention-days: 5
+
+  publish-packages:
+    name: Publish Packages
+    runs-on: ubuntu-latest
+    needs: [ build ]
+    if: github.event_name == 'push' && github.ref == 'refs/heads/main'
+    steps:
+      - uses: actions/download-artifact@v4
+        with:
+          path: artifacts
+
+      - name: Publish firmware packages to Gitea
+        run: |
+          TIMESTAMP=$(date +%s)
+
+          # Create package directory
+          mkdir -p packages
+
+          # Collect and rename all firmware binaries
+          for dir in artifacts/firmware-*/; do
+            board_name=$(basename "$dir" | sed 's/^firmware-//')
+            cp "$dir/firmware.bin" "packages/${board_name}-${TIMESTAMP}.bin"
+            echo "📦 Prepared: ${board_name}-${TIMESTAMP}.bin"
+          done
+
+          # Upload each firmware to Gitea generic package registry
+          for bin_file in packages/*.bin; do
+            filename=$(basename "$bin_file")
+            echo "⬆️  Publishing $filename..."
+
+            curl -X POST \
+              -H "Authorization: token ${{ secrets.GITEA_TOKEN }}" \
+              -F "file=@${bin_file}" \
+              "${{ gitea.server_url }}/api/packages/${{ gitea.repository_owner }}/generic/firmware/${{ github.ref_name }}/${filename}"
+          done
+
   summary:
     name: Build Summary
     runs-on: ubuntu-latest
-    needs: [ lint, test, build ]
+    needs: [ lint, test, build, publish-packages ]
     if: always()
     steps:
       - name: Check status
@@ -89,4 +131,8 @@ jobs:
             echo "❌ CI failed"
             exit 1
           fi
+          if [ "${{ needs.publish-packages.result }}" != "skipped" ] && [ "${{ needs.publish-packages.result }}" = "failure" ]; then
+            echo "⚠️  Build succeeded but package publishing failed"
+            exit 1
+          fi
           echo "✅ All checks passed"