Improvements for docker build process (#237)

.github/workflows/build-and-push-docker-base-image.yaml

@@ -0,0 +1,44 @@
+name: Build and push Docker base image
+
+on:
+  push:
+    paths:
+      - ./Dockerfile.base
+    branches:
+      - master
+
+env:
+  ALPINE_VERSION: 3.15
+
+jobs:
+  build-and-push-docker-base-image:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v3
+
+      - name: Set up QEMU
+        uses: docker/setup-qemu-action@v1
+
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v1
+
+      - name: Login to GitHub Container Registry
+        uses: docker/login-action@v1
+        with:
+          registry: ghcr.io
+          username: ${{ github.repository_owner }}
+          password: ${{ secrets.GITHUB_TOKEN }}
+
+      - name: Build and push
+        uses: docker/build-push-action@v2
+        with:
+          context: .
+          platforms: linux/amd64,linux/arm64,linux/arm/v7
+          file: Dockerfile.base
+          build_args:
+            - ALPINE_VERSION=${{ env.ALPINE_VERSION }}
+          push: true
+          tags: |
+            ghcr.io/plankanban/planka:base-latest
+            ghcr.io/plankanban/planka:base-${{ env.ALPINE_VERSION }}