ci: support multi-arch docker builds with QEMU/Buildx in release job

Author: dmirtillo

.github/workflows/build.yml

@@ -131,6 +131,12 @@ jobs:
         with:
           go-version-file: 'go.mod'
 
+      - name: Set up QEMU
+        uses: docker/setup-qemu-action@v2
+
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v2
+
       - name: Login to GHCR
         uses: docker/login-action@v2
         with:

.goreleaser.yaml

@@ -55,6 +55,7 @@ dockers:
     image_templates:
       - "ghcr.io/dmirtillo/rcon-cli:{{ .Version }}-amd64"
     dockerfile: build/docker/Dockerfile.goreleaser
+    use: buildx
     build_flag_templates:
       - "--platform=linux/amd64"
   - id: rcon-arm64
@@ -63,6 +64,7 @@ dockers:
     image_templates:
       - "ghcr.io/dmirtillo/rcon-cli:{{ .Version }}-arm64"
     dockerfile: build/docker/Dockerfile.goreleaser
+    use: buildx
     build_flag_templates:
       - "--platform=linux/arm64"