New image tagging stage script

Author: rfk-nc

.azuredevops/templates/steps/acr-import-retag-verbose.yaml

@@ -27,12 +27,12 @@ steps:
         wait_for_completion() {
             echo "##[debug] Waiting for all background import tasks to complete..."
             # Nameref to the array name passed as $1 (requires Bash 4.3+)
-            local -n arr=$1 
+            local -n arr=$1
             local exit_code=0
             for pid in "${arr[@]}"; do
                 # Wait for each process and check its exit code
-                wait "${pid}" || { 
-                    echo "##[error] Import task with PID ${pid} failed. The pipeline will fail." 
+                wait "${pid}" || {
+                    echo "##[error] Import task with PID ${pid} failed. The pipeline will fail."
                     exit_code=1
                 }
             done
@@ -65,7 +65,7 @@ steps:
 
             echo "##[debug] Authenticating with Destination Registry ${DEST_REGISTRY}..."
             az acr login --name "${DEST_REGISTRY}"
-            
+
             # Reset subscription back to Source to get the list of repositories.
             echo "##[debug] Resetting subscription to Source (${SRC_REGISTRY}) to list repositories."
             az account set -s "${SRC_HUB_SUB_ID}"
@@ -88,10 +88,10 @@ steps:
         # 5. Perform the parallel import/tagging loop
         echo "##[section] Starting Parallel Import/Tagging"
         for repo in ${repos}; do
-            
+
             # Set subscription to SOURCE for the tag existence check
             az account set -s "${SRC_HUB_SUB_ID}"
-            
+
             # Check if the specific tag exists for the repository
             tag_exists=$(az acr repository show-tags \
                 --name "${SRC_REGISTRY}" \
@@ -104,11 +104,11 @@ steps:
             az account set -s "${DEST_HUB_SUB_ID}"
 
             if [[ -n "$tag_exists" ]]; then
-                # If cross-registry, src_reg_prefix is empty (path: repo:tag). 
+                # If cross-registry, src_reg_prefix is empty (path: repo:tag).
                 # If same-registry, src_reg_prefix is FQDN (path: acr.azurecr.io/repo:tag).
                 SOURCE_IMAGE_PATH="${src_reg_prefix}${repo}:${SELECT_IMAGE_TAG}"
                 DEST_IMAGE_PATH="${repo}:${ADD_IMAGE_TAG}"
-                
+
                 echo "##[debug] Importing ${SOURCE_IMAGE_PATH} to ${DEST_REGISTRY}/${DEST_IMAGE_PATH}..."
 
                 # az acr import runs against the currently selected subscription (DEST_HUB_SUB_ID).