Use the API URL from the environment if it is present.

lib/analyze-action.js

@@ -74,6 +74,7 @@ async function run() {
         const apiDetails = {
             auth: actionsUtil.getRequiredInput("token"),
             url: util.getRequiredEnvParam("GITHUB_SERVER_URL"),
+            apiURL: util.getRequiredEnvParam("GITHUB_API_URL"),
         };
         const outputDir = actionsUtil.getRequiredInput("output");
         const threads = util.getThreadsFlag(actionsUtil.getOptionalInput("threads") || process.env["CODEQL_THREADS"], logger);