Look up host image tags in promotion

Author: MoteHue

.github/workflows/overcloud-host-image-promote.yml

@@ -67,6 +67,20 @@ jobs:
           source src/kayobe-config/kayobe-env --environment ci-builder &&
           kayobe control host bootstrap
 
+      - name: Gather Rocky Linux 9 overcloud host image tag
+        id: rocky9_image_tag
+        run: |
+          echo image_tag=$(grep stackhpc_rocky_9_overcloud_host_image_version: etc/kayobe/pulp-host-image-versions.yml | awk '{print $2}') >> $GITHUB_OUTPUT
+        working-directory: src/kayobe-config
+        if: inputs.rocky9
+
+      - name: Gather Ubuntu Noble overcloud host image tag
+        id: ubuntu_noble_image_tag
+        run: |
+          echo image_tag=$(grep stackhpc_ubuntu_noble_overcloud_host_image_version: etc/kayobe/pulp-host-image-versions.yml | awk '{print $2}') >> $GITHUB_OUTPUT
+        working-directory: src/kayobe-config
+        if: inputs.ubuntu-noble
+
       - name: Promote Rocky Linux 9 overcloud host image artifact
         run: |
           source venvs/kayobe/bin/activate &&
@@ -77,7 +91,7 @@ jobs:
           -e os_distribution='rocky' \
           -e os_release='9'
         env:
-          ARTIFACT_TAG: "{{ stackhpc_rocky_9_overcloud_host_image_version }}"
+          ARTIFACT_TAG: "${{ steps.rocky9_image_tag.outputs.rocky9_image_tag }}"
           KAYOBE_VAULT_PASSWORD: ${{ secrets.KAYOBE_VAULT_PASSWORD }}
         if: inputs.rocky9
 
@@ -91,6 +105,6 @@ jobs:
           -e os_distribution='ubuntu' \
           -e os_release='noble'
         env:
-          ARTIFACT_TAG: "{{ stackhpc_ubuntu_noble_overcloud_host_image_version }}"
+          ARTIFACT_TAG: "${{ steps.ubuntu_noble_image_tag.outputs.ubuntu_noble_image_tag }}"
           KAYOBE_VAULT_PASSWORD: ${{ secrets.KAYOBE_VAULT_PASSWORD }}
         if: inputs.ubuntu-noble