feat: add GitHub Actions workflow for building and pushing Docker images

Author: reoring

.github/workflows/docker-build.yml

@@ -0,0 +1,55 @@
+name: Build & Push Docker image
+
+on:
+  push:
+    tags:
+      - 'v*.*.*'
+
+permissions:
+  contents: read
+  packages: write
+
+concurrency:
+  group: docker-${{ github.ref }}
+  cancel-in-progress: true
+
+jobs:
+  docker-build:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout source
+        uses: actions/checkout@v4
+        with:
+          fetch-depth: 0
+
+      - name: Set up QEMU
+        uses: docker/setup-qemu-action@v3
+
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v3
+
+      - name: Log in to GHCR
+        uses: docker/login-action@v3
+        with:
+          registry: ghcr.io
+          username: ${{ github.actor }}
+          password: ${{ secrets.GITHUB_TOKEN }}
+
+      - name: Build and push Docker image
+        uses: docker/build-push-action@v5
+        with:
+          context: .
+          push: true
+          platforms: linux/amd64,linux/arm64
+          tags: |
+            ghcr.io/${{ github.repository_owner }}/plexaubnet:${{ github.ref_name }}
+            ghcr.io/${{ github.repository_owner }}/plexaubnet:latest
+          labels: |
+            org.opencontainers.image.source=${{ github.server_url }}/${{ github.repository }}
+            org.opencontainers.image.revision=${{ github.sha }}
+            org.opencontainers.image.version=${{ github.ref_name }}
+            org.opencontainers.image.created=${{ github.event.repository.updated_at }}
+          cache-from: type=gha
+          cache-to: type=gha,mode=max
+          provenance: false
+          sbom: false