Replace existing worflow with publish-on-tag

Author: nmfretz

.github/workflows/ci.yml

@@ -0,0 +1,42 @@
+name: Publish Docker image on tag
+
+on:
+  push:
+    tags:
+      - 'v*'
+
+jobs:
+  push_to_dockerhub:
+    name: Push Docker image to Docker Hub
+    runs-on: ubuntu-22.04
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v4
+
+      - name: Extract metadata
+        id: meta
+        run: |
+          echo "TAG=${GITHUB_REF#refs/tags/}" >> $GITHUB_OUTPUT
+          echo "VERSION=${GITHUB_REF#refs/tags/v}" >> $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: ${{ secrets.DOCKERHUB_USERNAME }}
+          password: ${{ secrets.DOCKERHUB_TOKEN }}
+
+      - name: Build and push
+        uses: docker/build-push-action@v6
+        with:
+          context: .
+          platforms: linux/amd64,linux/arm64
+          push: true
+          tags: getumbrel/bitcoind:${{ steps.meta.outputs.TAG }}
+          build-args: |
+            VERSION=${{ steps.meta.outputs.VERSION }}