fix(ci): improve ubuntu version sync workflow

- Renames the workflow for clarity in pull requests.
- Restricts Dockerfile checks to the 'infra' directory.
- Fixes bash syntax for array iteration.

Author: hunsche

.github/workflows/ubuntu_version_sync.yml

@@ -14,7 +14,7 @@
 #
 ################################################################################
 
-name: 'Ubuntu Version Sync'
+name: 'Ubuntu Version Sync Check'
 
 on:
   pull_request:
@@ -63,27 +63,27 @@ jobs:
         VERSIONS=("ubuntu-20-04" "ubuntu-24-04")
 
         # Check Dockerfiles
-        for legacy_file in "${{!LEGACY_DOCKERFILES[@]}}"; do
-          if echo "$MODIFIED_FILES" | grep -q "^${legacy_file}$"; then
+        for legacy_file in "${!LEGACY_DOCKERFILES[@]}"; do
+          if [[ "${legacy_file}" == infra/* ]] && echo "$MODIFIED_FILES" | grep -q "^${legacy_file}$"; then
             echo "Legacy file changed: $legacy_file. Verifying counterparts..."
-            for version in "${{VERSIONS[@]}}"; do
-              pattern=${{LEGACY_DOCKERFILES[$legacy_file]}}
-              versioned_file="${{pattern/{{version}}/$version}}"
-              if ! echo "$MODIFIED_FILES" | grep -q "^${{versioned_file}}$"; then
+            for version in "${VERSIONS[@]}"; do
+              pattern="${LEGACY_DOCKERFILES[$legacy_file]}"
+              versioned_file="${pattern/\{version\}/$version}"
+              if ! echo "$MODIFIED_FILES" | grep -q "^${versioned_file}$"; then
                 ERRORS+="\n- Legacy file '${legacy_file}' was changed, but its counterpart '${versioned_file}' was not."
               fi
             done
           fi
         done
 
         # Check Scripts
-        for legacy_file in "${{!LEGACY_SCRIPTS[@]}}"; do
+        for legacy_file in "${!LEGACY_SCRIPTS[@]}"; do
           if echo "$MODIFIED_FILES" | grep -q "^${legacy_file}$"; then
             echo "Legacy script changed: $legacy_file. Verifying counterparts..."
-            for version in "${{VERSIONS[@]}}"; do
-              pattern=${{LEGACY_SCRIPTS[$legacy_file]}}
-              versioned_file="${{pattern/{{version}}/$version}}"
-              if ! echo "$MODIFIED_FILES" | grep -q "^${{versioned_file}}$"; then
+            for version in "${VERSIONS[@]}"; do
+              pattern="${LEGACY_SCRIPTS[$legacy_file]}"
+              versioned_file="${pattern/\{version\}/$version}"
+              if ! echo "$MODIFIED_FILES" | grep -q "^${versioned_file}$"; then
                 ERRORS+="\n- Legacy script '${legacy_file}' was changed, but its counterpart '${versioned_file}' was not."
               fi
             done