.

dist/index.js

@@ -8111,6 +8111,7 @@ function downloadRepository(accessToken, owner, repo, ref, repositoryPath) {
         console.log(`status=${response.status}`);
         console.log(`headers=${JSON.stringify(response.headers)}`);
         console.log(`data=${JSON.stringify(typeof response.data)}`);
+        console.log(`data.length=${response.data.length}`);
         const runnerTemp = process.env['RUNNER_TEMP'];
         assert.ok(runnerTemp, 'RUNNER_TEMP not defined');
         const archiveFile = path.join(runnerTemp, 'checkout.tar.gz');

src/github-api-helper.ts

@@ -35,10 +35,11 @@ export async function downloadRepository(
   console.log(`status=${response.status}`)
   console.log(`headers=${JSON.stringify(response.headers)}`)
   console.log(`data=${JSON.stringify(typeof response.data)}`)
+  console.log(`data.length=${(response.data as Buffer).length}`)
   const runnerTemp = process.env['RUNNER_TEMP'] as string
   assert.ok(runnerTemp, 'RUNNER_TEMP not defined')
   const archiveFile = path.join(runnerTemp, 'checkout.tar.gz')
-  await fs.promises.writeFile(archiveFile, response.data)
+  await fs.promises.writeFile(archiveFile, response.data as Buffer)
   await exec.exec(`ls -la "${archiveFile}"`, [], {
     cwd: repositoryPath
   } as ExecOptions)