Build/Test Tools: Support Docker compose override files.

This updates the logic introduced in [59279] to account for the presence of `docker-compose.override.yml` files.

Reviewed by peterwilsoncc.
Merges 59283] to the 6.7 branch.

Props xknown, davidbaumwald.
See #61218.

git-svn-id: https://develop.svn.wordpress.org/branches/6.7@59311 602fd350-edb4-49c9-b593-d223f7449a82

tools/local-env/scripts/utils.js

@@ -1,3 +1,5 @@
+const { existsSync } = require( 'node:fs' );
+
 const local_env_utils = {
 
 	/**
@@ -12,6 +14,10 @@ const local_env_utils = {
 	get_compose_files: function() {
 		var composeFiles = '-f docker-compose.yml';
 
+		if ( existsSync( 'docker-compose.override.yml' ) ) {
+			composeFiles = composeFiles + ' -f docker-compose.override.yml';
+		}
+
 		if ( process.env.LOCAL_DB_TYPE !== 'mysql' ) {
 			return composeFiles;
 		}