Replace matrix strategy with explicit parallel build jobs

- Create separate build-heltec-v3 and build-seeed-xiao jobs
- Both build jobs run in parallel after verify completes
- Explicit job dependencies ensure guaranteed parallelization
- Each job has its own PlatformIO cache key for better hit rates

.gitea/workflows/ci.yml

@@ -33,17 +33,10 @@ jobs:
           python -m pytest kiss_client.py -v 2>/dev/null || echo "Note: Full integration tests require simulator"
         continue-on-error: true
 
-  build:
-    name: Build ${{ matrix.target }}
+  build-heltec-v3:
+    name: Build heltec_v3
     runs-on: ubuntu-latest
     needs: [ verify ]
-    strategy:
-      fail-fast: false
-      matrix:
-        target:
-          - heltec_v3
-          - seeed_xiao_s3_wio_sx1262
-
     steps:
       - uses: actions/checkout@v4
 
@@ -59,22 +52,53 @@ jobs:
         uses: actions/cache@v3
         with:
           path: ~/.platformio
-          key: ${{ runner.os }}-platformio-${{ hashFiles('**/platformio.ini') }}
+          key: ${{ runner.os }}-platformio-heltec-v3-${{ hashFiles('**/platformio.ini') }}
 
-      - name: Build ${{ matrix.target }}
-        run: pio run -e ${{ matrix.target }}
+      - name: Build heltec_v3
+        run: pio run -e heltec_v3
 
       - name: Upload firmware artifact
         uses: actions/upload-artifact@v4
         with:
-          name: firmware-${{ matrix.target }}
-          path: .pio/build/${{ matrix.target }}/firmware.bin
+          name: firmware-heltec_v3
+          path: .pio/build/heltec_v3/firmware.bin
+          retention-days: 5
+
+  build-seeed-xiao:
+    name: Build seeed_xiao_s3_wio_sx1262
+    runs-on: ubuntu-latest
+    needs: [ verify ]
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Set up Python
+        uses: actions/setup-python@v4
+        with:
+          python-version: '3.11'
+
+      - name: Install PlatformIO
+        run: pip install platformio
+
+      - name: Cache PlatformIO
+        uses: actions/cache@v3
+        with:
+          path: ~/.platformio
+          key: ${{ runner.os }}-platformio-seeed-xiao-${{ hashFiles('**/platformio.ini') }}
+
+      - name: Build seeed_xiao_s3_wio_sx1262
+        run: pio run -e seeed_xiao_s3_wio_sx1262
+
+      - name: Upload firmware artifact
+        uses: actions/upload-artifact@v4
+        with:
+          name: firmware-seeed_xiao_s3_wio_sx1262
+          path: .pio/build/seeed_xiao_s3_wio_sx1262/firmware.bin
           retention-days: 5
 
   publish-packages:
     name: Publish Packages
     runs-on: ubuntu-latest
-    needs: [ build ]
+    needs: [ build-heltec-v3, build-seeed-xiao ]
     if: github.event_name == 'push' && github.ref == 'refs/heads/main'
     steps:
       - uses: actions/download-artifact@v4
@@ -109,12 +133,12 @@ jobs:
   summary:
     name: Build Summary
     runs-on: ubuntu-latest
-    needs: [ verify, build, publish-packages ]
+    needs: [ verify, build-heltec-v3, build-seeed-xiao, publish-packages ]
     if: always()
     steps:
       - name: Check status
         run: |
-          if [ "${{ needs.verify.result }}" = "failure" ] || [ "${{ needs.build.result }}" = "failure" ]; then
+          if [ "${{ needs.verify.result }}" = "failure" ] || [ "${{ needs.build-heltec-v3.result }}" = "failure" ] || [ "${{ needs.build-seeed-xiao.result }}" = "failure" ]; then
             echo "❌ CI failed"
             exit 1
           fi