fix(ci): ignore false [skip-build] matches in PR image check

Use --first-parent and match subject-line skip tags only so merged main
chore commits and fix commit prose do not skip the PR image build.

Co-authored-by: Cursor <cursoragent@cursor.com>

Author: schultzp2020

.github/actions/check-image-and-changes/action.yaml

@@ -41,9 +41,11 @@ runs:
         echo "Changed files:"
         echo "$CHANGED_FILES"
 
-        # Check for [skip-build] tag in commit messages
+        # Check for [skip-build] on PR commits only. Without --first-parent, merge
+        # refs pull in main chore commits like "update rpms.lock.yaml [skip-build]".
+        # Match subject-line tags only (not body text or mid-subject mentions).
         SKIP_BUILD_TAG=false
-        if git log --format=%B "$BASE_COMMIT"..HEAD | grep -qF "[skip-build]"; then
+        if git log --first-parent --format=%s "$BASE_COMMIT"..HEAD | grep -qE '\[skip-build\](\s*\[skip-e2e\])?(\s*\(#\d+\))?$'; then
           echo "Found [skip-build] tag in commit messages."
           SKIP_BUILD_TAG=true
         fi