Add Raspberry Pi build workflow to release process

.github/workflows/release.yml

@@ -63,6 +63,44 @@ jobs:
         asset_path: ./build/${{ env.ARCHIVE_NAME }}
         asset_name: ${{ env.ARCHIVE_NAME }}
         asset_content_type: application/tgz
+
+  build-rpi:
+    name: Build Raspberry Pi
+    needs: create_release
+    strategy:
+      matrix:
+        native_arch: [rpi4, rpi5]
+    runs-on: ubuntu-latest
+    container: 
+      image: ghcr.io/tttapa/docker-arm-cross-toolchain:aarch64-rpi3-linux-gnu
+    env:
+      ARCHIVE_NAME: neural_amp_modeler_lv2_{{ matrix.native_arch }}.tgz
+    steps:
+    - uses: actions/checkout@v3.3.0
+      with:
+        submodules: recursive
+    
+    - name: Build Plugin
+      working-directory: ${{github.workspace}}/build
+      env:
+        CXX: clang++
+      run: |
+        cmake .. -DCMAKE_BUILD_TYPE=$BUILD_TYPE -DBUILD_NAMCORE=ON -DBUILD_INTERNAL_STATIC_WAVENET=ON -DBUILD_INTERNAL_STATIC_LSTM=ON
+        cmake --build . --config $BUILD_TYPE -j4
+
+    - name: Add LV2 Archive
+      working-directory: ${{github.workspace}}/build
+      run: tar -czf ${{ env.ARCHIVE_NAME }} neural_amp_modeler.lv2
+      
+    - name: Upload Plugin Asset
+      uses: actions/upload-release-asset@v1
+      env:
+        GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+      with:
+        upload_url: ${{ needs.create_release.outputs.upload_url }}
+        asset_path: ./build/${{ env.ARCHIVE_NAME }}
+        asset_name: ${{ env.ARCHIVE_NAME }}
+        asset_content_type: application/tgz
         
   build-windows:
     name: Build Windows