chore: only check md file (#1475)

Author: iowillhoit

.github/workflows/supportedMetadataUpdate.yml

@@ -28,7 +28,7 @@ jobs:
       - run: yarn build
       - run: yarn update-supported-metadata
       - run: |
-          if [[ -n $(git status --short) ]]; then
+          if [[ -n $(git status --short METADATA_SUPPORT.md) ]]; then
             git add METADATA_SUPPORT.md
             git commit -m "chore: auto-update metadata coverage in METADATA_SUPPORT.md [no ci]" --no-verify
             git push --no-verify