Set uniquely cluster_name for each workflow instance

Author: m-bull

.github/extra_vars/arcus.yml

@@ -1,5 +1,4 @@
 # Cluster instance vars
-cluster_name: "caas-ci"
 cluster_id: "{{ cluster_name }}"
 openhpc_slurm_partitions:
   - name: "small"

.github/workflows/build-image-deploy.yml

@@ -49,6 +49,7 @@ jobs:
           -i image-build/hosts \
           -e @${EXTRA_VARS_FILE} \
           -e '{"write_cluster_image_uuid_file": true}' \
+          -e image_build_cluster_id="image-build-${GITHUB_SHA::7}"
           image-build.yml
           echo "CLUSTER_IMAGE=$(cat cluster_image_uuid.txt)" >> $GITHUB_OUTPUT
         env:
@@ -61,6 +62,7 @@ jobs:
           -i image-build/hosts \
           -e @${EXTRA_VARS_FILE} \
           -e cluster_state=absent \
+          -e image_build_cluster_id="image-build-${GITHUB_SHA::7}"
           image-build.yml
         if: always()
 
@@ -72,6 +74,7 @@ jobs:
           -i image-build/hosts \
           -e @${EXTRA_VARS_FILE} \
           -e cluster_image=${{ steps.build.outputs.CLUSTER_IMAGE }} \
+          -e cluster_name="caas-ci-${GITHUB_SHA::7}" \
           slurm-infra.yml
         if: success()
 
@@ -83,6 +86,7 @@ jobs:
           -e @${EXTRA_VARS_FILE} \
           -e cluster_image=${{ steps.build.outputs.CLUSTER_IMAGE }} \
           -e cluster_state=absent \
+          -e cluster_name="caas-ci-${GITHUB_SHA::7}" \
           slurm-infra.yml
         if: | 
           ( failure() || cancelled() ) &&