add github workflow

.github/workflows/build.yaml

@@ -0,0 +1,71 @@
+name: Build RPMs
+
+on:
+  [push, workflow_dispatch]
+
+env:
+  OS_VERSION: 4.5.0.16
+
+jobs:
+  build:
+    runs-on: ubuntu-22.04
+    name: Build App
+    strategy:
+      matrix:
+        arch: ['armv7hl', 'aarch64', 'i486']
+    steps:
+    - uses: actions/checkout@v3
+    - name: Prepare
+      run: docker pull coderus/sailfishos-platform-sdk:$OS_VERSION && mkdir output
+    - name: Build ${{ matrix.arch }}
+      run: docker run --rm --privileged -v $PWD:/share coderus/sailfishos-platform-sdk:$OS_VERSION /bin/bash -c "
+            mkdir -p build ;
+            cd build ;
+            cp -r /share/* . ;
+            mb2 -t SailfishOS-$OS_VERSION-${{ matrix.arch }} build ;
+            sudo cp -r RPMS/*.rpm /share/output"
+    - name: Upload RPM (${{ matrix.arch }})
+      uses: actions/upload-artifact@v3
+      with:
+        name: rpm-${{ matrix.arch }}
+        path: output
+
+  release:
+    name: Release
+    if: startsWith(github.ref, 'refs/tags/v')
+    needs:
+      - build
+    runs-on: ubuntu-22.04
+    steps:
+      - name: Download armv7hl
+        uses: actions/download-artifact@v2
+        with:
+          name: rpm-armv7hl
+        continue-on-error: true
+      - name: Download aarch64
+        uses: actions/download-artifact@v2
+        with:
+          name: rpm-aarch64
+        continue-on-error: true
+      - name: Download i486
+        uses: actions/download-artifact@v2
+        with:
+          name: rpm-i486
+        continue-on-error: true
+      - name: Extract Version Name
+        id: extract_name
+        uses: actions/github-script@v4
+        with:
+          result-encoding: string
+          script: |
+            return context.payload.ref.replace(/refs\/tags\//, '');
+      - name: Create a Release
+        uses: softprops/action-gh-release@v1
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+        with:
+          name: ${{ steps.extract_name.outputs.result }}
+          draft: false
+          prerelease: false
+          body: This release was autogenerated.
+          files: '*.rpm'