Add linux build

.github/workflows/build_linux.yaml

@@ -0,0 +1,39 @@
+name: Build Linux artifacts
+
+on: workflow_dispatch
+
+jobs:
+  build-linux:
+    runs-on:
+      - ubuntu-latest
+    permissions:
+      contents: write
+    steps:
+    - name: Checkout repository
+      uses: actions/checkout@v4
+    - name: Login to GitHub Container Registry
+      uses: docker/login-action@v3
+      with:
+          registry: ghcr.io
+          username: ${{ github.actor }}
+          password: ${{ secrets.GITHUB_TOKEN }}
+    - name: Set up Docker Buildx
+      uses: docker/setup-buildx-action@v3
+    - name: Cache Docker layers
+      uses: actions/cache@v4
+      with:
+        path: /tmp/.buildx-cache
+        key: ${{ runner.os }}-buildx-${{ github.sha }}
+        restore-keys: |
+          ${{ runner.os }}-buildx-
+    - name: Run Docker Container
+      run: |
+        docker run --rm \
+          --volume "${{ github.workspace }}:/src/" \
+          --env SPECFILE=./BTClockOTA.spec \
+          ghcr.io/btclock/pyinstaller-wxpython-linux:latest
+    - name: Archive artifacts
+      uses: actions/upload-artifact@v4
+      with:
+        name: linux-artifacts
+        path: dist/