message: Use path.resolve instead of path.join for sourceRoot
  Thanks to `path.resolve()` should will nicely handle more use-cases, namely absolute paths better than `path.join()`.
diff: @@ -203,7 +203,7 @@ async function run() {
  const codeqlRam = process.env["CODEQL_RAM"] || "6500";
  core.exportVariable("CODEQL_RAM", codeqlRam);
  - const sourceRoot = path.join(
  + const sourceRoot = path.resolve(
  getRequiredEnvParam("GITHUB_WORKSPACE"),
  getOptionalInput("source-root") || ""
  );
  