Add newline to EOF

Signed-off-by: Andrew Symington <simmers@intrinsic.ai>

Author: asymingt

.github/workflows/preserve_cache.yaml

@@ -63,4 +63,4 @@ jobs:
           tag_name: ${{ env.RELEASE }}
           files: |
             ${{ env.DISTRIBUTION }}-cache.yaml.gz
-            index-v4.yaml
+            index-v4.yaml