add docker build

.env.dist

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+DEBUG=false
+PORT=5000
+AUTOCONFIGURE_REVERSE_PROXY_MODE=false
+AUTOCONFIGURE_LX_FILE=/home/pi/.config/lxsession/LXDE-pi/autostart # Replace by "./var/run/dummy" if not needed

.github/workflows/master.yml

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+name: Build and Push Docker images
+
+on:
+  push:
+    branches:
+      - main
+    paths:
+      - 'version.txt'
+  pull_request:
+    branches:
+      - main
+
+jobs:
+  build-and-push:
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@v2
+
+    - name: Read Version
+      id: version
+      run: echo "::set-output name=VERSION::$(cat version.txt)"
+
+    - name: Set up QEMU
+      uses: docker/setup-qemu-action@v1
+
+    - name: Set up Docker Buildx
+      uses: docker/setup-buildx-action@v1
+
+    - name: Login to DockerHub
+      uses: docker/login-action@v1
+      with:
+        username: ${{ secrets.DOCKER_USERNAME }}
+        password: ${{ secrets.DOCKER_PASSWORD }}
+
+    - name: Build and push
+      uses: docker/build-push-action@v2
+      with:
+        context: .
+        file: ./Dockerfile
+        push: true
+        tags: jierka/obscreen:${{ steps.version.outputs.VERSION }}
+        platforms: linux/amd64, linux/arm64/v8, linux/arm/v7
+
+    - name: Create and push manifest
+      uses: docker/metadata-action@v3
+      with:
+        images: jierka/obscreen
+        tags: type=semver,pattern={{version}}

version.txt

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+1.1