add cross-arch aarch64 container image builds

.github/workflows/stackhpc-container-image-build.yml

@@ -13,6 +13,11 @@ on:
         type: boolean
         required: false
         default: true
+      overcloud-r9-aarch64:
+        description: Build overcloud Rocky Linux 9 AARCH64 images?
+        type: boolean
+        required: false
+        default: false
       seed:
         description: Build seed images?
         type: boolean
@@ -180,7 +185,7 @@ jobs:
         run: |
           args="${{ inputs.regexes }}"
           args="$args -e kolla_base_distro=${{ matrix.distro }}"
-          args="$args -e kolla_tag=${{ steps.write-kolla-tag.outputs.kolla-tag }}"
+          args="$args -e kolla_tag=${{ steps.write-kolla-tag.outputs.kolla-tag }}-amd64"
           args="$args -e stackhpc_repo_mirror_auth_proxy_enabled=true"
           source venvs/kayobe/bin/activate &&
           source src/kayobe-config/kayobe-env --environment ci-builder &&
@@ -189,6 +194,22 @@ jobs:
           KAYOBE_VAULT_PASSWORD: ${{ secrets.KAYOBE_VAULT_PASSWORD }}
         if: inputs.overcloud
 
+      - name: Build kolla overcloud images Rocky 9 AARCH64
+        id: build_overcloud_images_r9_aarch64
+        continue-on-error: true
+        run: |
+          args="${{ inputs.regexes }}"
+          args="$args -e kolla_base_distro=rocky"
+          args="$args -e kolla_base_arch=aarch64"
+          args="$args -e kolla_tag=${{ steps.write-kolla-tag.outputs.kolla-tag }}-aarch64"
+          args="$args -e stackhpc_repo_mirror_auth_proxy_enabled=true"
+          source venvs/kayobe/bin/activate &&
+          source src/kayobe-config/kayobe-env --environment ci-builder &&
+          kayobe overcloud container image build $args
+        env:
+          KAYOBE_VAULT_PASSWORD: ${{ secrets.KAYOBE_VAULT_PASSWORD }}
+        if: inputs.overcloud-r9-aarch64
+
       - name: Copy overcloud container image build logs to output directory
         run: sudo mv /var/log/kolla-build.log image-build-logs/kolla-build-overcloud.log
         if: inputs.overcloud