fix: diff should skip schemaless migrations

scripts/diff.sh

@@ -23,13 +23,14 @@ if [[ -z "$base" ]] || [[ -z "$head" ]]; then
   exit 1;
 fi
 
-if ! (git diff --quiet "$base..$head" -- ./schema); then
+schema_changed=$(git diff --quiet "$base" "$head" -- ./schema)
+schema_changed_exit=$?
+if [[ $schema_changed_exit="1" ]]; then
   echo ""
   exit 0;
 fi;
 
 if [[ ! -f "$migration" ]]; then
-  docker compose down -v
   ./scripts/build.sh base "$base" 1>&2 || (echo "base failed to build" && exit 1)
   ./scripts/build.sh head "$head" 1>&2 || (echo "head failed to build" && exit 1)