Add a new function used to determine where to retrieve config from

lib/config-utils.js

@@ -219,6 +219,14 @@ function initConfig() {
     }
     return config;
 }
+function isLocal(configPath) {
+    // If the path starts with ./, look locally
+    if (configPath.indexOf("./") === 0) {
+        return true;
+    }
+    return (configPath.indexOf("@") === -1);
+}
+exports.isLocal = isLocal;
 function getConfigFolder() {
     return util.getRequiredEnvParam('RUNNER_TEMP');
 }

lib/config-utils.test.js

@@ -137,6 +137,15 @@ ava_1.default("Octokit not used when reading local config", async (t) => {
         t.false(spyKit.called);
     });
 });
+ava_1.default("Remote and local configuration paths correctly identified", t => {
+    // If the path starts with ./, look locally
+    t.assert(configUtils.isLocal('./file'));
+    t.assert(configUtils.isLocal('./file@name'));
+    // Otherwise, if the path contains @ (branch specifier), assume it's a remote repo
+    t.false(configUtils.isLocal('octo-org/codeql-config/config.yaml@main'));
+    // Otherwise look locally (this is the fallback)
+    t.assert(configUtils.isLocal('file'));
+});
 function doInvalidInputTest(testName, inputFileContents, expectedErrorMessageGenerator) {
     ava_1.default("load invalid input - " + testName, async (t) => {
         return await util.withTmpDir(async (tmpDir) => {