Setup Docker Buildx for multi-arch images

Author: pingtimeout

.github/workflows/release-3-build-and-publish-artifacts.yml

@@ -257,6 +257,12 @@ jobs:
           distribution: 'temurin'
           java-version: '21'
 
+      - name: Set up QEMU
+        uses: docker/setup-qemu-action@29109295f81e9208d7d86ff1c6c12d2833863392
+
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v3
+
       - name: Build Polaris Server Docker image
         run: |
           source "${LIBS_DIR}/_exec.sh"

.github/workflows/release-4-publish-release.yml

@@ -251,6 +251,12 @@ jobs:
           distribution: 'temurin'
           java-version: '21'
 
+      - name: Set up QEMU
+        uses: docker/setup-qemu-action@29109295f81e9208d7d86ff1c6c12d2833863392
+
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v3
+
       - name: Log in to Docker Hub
         if: env.DRY_RUN == '0'
         run: |