chore: show the source backstage version in compatibility check report.

Signed-off-by: David Festal <dfestal@redhat.com>

Author: davidfestal

.github/workflows/check-backstage-compatibility.yaml

@@ -134,7 +134,8 @@ jobs:
 
             if [[ -f "${d}/plugins-list.yaml" ]] && [[ -f "${d}/source.json" ]]
             then
-              workspaceBackstageVersion=$(jq -r '.["repo-backstage-version"] // ""' "${d}/source.json")
+              sourceBackstageVersion=$(jq -r '.["repo-backstage-version"] // ""' "${d}/source.json")
+              workspaceBackstageVersion="${sourceBackstageVersion}"
               # If the workspace has an overridden backstage.json file in the overlay, use it to check the backstage version compatibility
               if [[ -f "${d}/backstage.json" ]]
               then
@@ -147,7 +148,11 @@ jobs:
                 incompatibleVersion="*not found*"
               elif [[ "${targetBackstageVersion}" != "$(semver -r ~${workspaceBackstageVersion} ${targetBackstageVersion})" ]]
               then
-                incompatibleVersion="${workspaceBackstageVersion}"
+                incompatibleVersion="${sourceBackstageVersion}"
+                if [[ "${incompatibleVersion}" == "" ]]
+                then
+                  incompatibleVersion="*not found*"
+                fi
               fi
               if [[ "${incompatibleVersion}" != "" ]]
               then