Add docker buildx to support multi-platform builds for release process

Signed-off-by: Flavius Lacatusu <flacatus@redhat.com>

.github/workflows/release.yml

@@ -17,6 +17,10 @@ jobs:
       - uses: actions/checkout@v2
         with:
           fetch-depth: 0
+      - name: Set up QEMU
+        uses: docker/setup-qemu-action@v1
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v1
       - name: Set up Python 3.6
         uses: actions/setup-python@v2
         with:

make-release.sh

@@ -26,6 +26,7 @@ init() {
   PREPARE_COMMUNITY_OPERATORS_UPDATE=false
   RELEASE_DIR=$(cd "$(dirname "$0")"; pwd)
   FORCE_UPDATE=""
+  BUILDX_PLATFORMS="linux/amd64,linux/ppc64le,linux/s390x"
 
   if [[ $# -lt 1 ]]; then usage; exit; fi
 
@@ -156,13 +157,11 @@ releaseOperatorCode() {
     git add -A || true # add new generated CSV files in olm/ folder
     git commit -am "Update defaults tags to "$RELEASE --signoff
   fi
-
-  echo "[INFO] releaseOperatorCode :: Build operator image"
-  docker build -t "quay.io/eclipse/che-operator:${RELEASE}" .
-
-  echo "[INFO] releaseOperatorCode :: Push image to quay.io"
+  echo "[INFO] releaseOperatorCode :: Login to quay.io..."
   docker login quay.io -u "${QUAY_ECLIPSE_CHE_USERNAME}" -p "${QUAY_ECLIPSE_CHE_PASSWORD}"
-  docker push quay.io/eclipse/che-operator:$RELEASE
+
+  echo "[INFO] releaseOperatorCode :: Build operator image in platforms: $BUILDX_PLATFORMS"
+  docker buildx build --platform "$BUILDX_PLATFORMS" --push -t "quay.io/eclipse/che-operator:${RELEASE}" .
 }
 
 updateNightlyOlmFiles() {