build: publish image of latest version

.github/workflows/publish-latest-version.yml

@@ -0,0 +1,53 @@
+name: Publish Latest Version
+
+on:
+  push:
+    tags:
+      - 'v*'
+  workflow_dispatch:
+
+jobs:
+  publish-latest-version:
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Extract Syncplay Version from Dockerfile
+        id: get-version
+        run: |
+          syncplay_version=$(grep -oP '(?<=ENV SYNCPLAY=")[^"]+' Dockerfile)
+          echo "syncplay_version=${syncplay_version}"
+          echo "syncplay_version=${syncplay_version}" >> $GITHUB_OUTPUT
+
+      - name: Set up QEMU
+        uses: docker/setup-qemu-action@v3
+
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v3
+
+      - name: Login to Docker Hub
+        uses: docker/login-action@v3
+        with:
+          username: ${{ vars.DOCKERHUB_USER }}
+          password: ${{ secrets.DOCKERHUB_TOKEN }}
+
+      - name: Login to GitHub Package Registry
+        uses: docker/login-action@v3
+        with:
+          registry: ghcr.io
+          username: ${{ github.repository_owner }}
+          password: ${{ secrets.GITHUB_TOKEN }}
+
+      - name: Build and Push
+        uses: docker/build-push-action@v6
+        with:
+          context: .
+          platforms: linux/amd64,linux/arm64,linux/386,linux/arm/v7
+          tags: |
+            ${{ vars.DOCKER_IMAGE }}:v${{ steps.get-version.outputs.syncplay_version }}
+            ghcr.io/${{ vars.DOCKER_IMAGE }}:v${{ steps.get-version.outputs.syncplay_version }}
+          push: true
+          cache-from: type=gha
+          cache-to: type=gha,mode=max