(fix): broken releases and e2e workflows (#4428)

.gcp/release-docker.yaml

@@ -48,7 +48,7 @@ steps:
       - |
         export GEMINI_SANDBOX_IMAGE_TAG=$$(cat /workspace/image_tag.txt)
         echo "Using Docker image tag for build: $$GEMINI_SANDBOX_IMAGE_TAG"
-        npm run build:sandbox
+        npm run build:sandbox -- --output-file /workspace/final_image_uri.txt
     env:
       - 'GEMINI_SANDBOX=$_CONTAINER_TOOL'
 

scripts/build_sandbox.js

@@ -40,6 +40,11 @@ const argv = yargs(hideBin(process.argv))
     alias: 'image',
     type: 'string',
     description: 'use <image> name for custom image',
+  })
+  .option('output-file', {
+    type: 'string',
+    description:
+      'Path to write the final image URI. Used for CI/CD pipeline integration.',
   }).argv;
 
 let sandboxCommand;
@@ -134,14 +139,21 @@ function buildImage(imageName, dockerfile) {
     { stdio: buildStdout, shell: '/bin/bash' },
   );
   console.log(`built ${finalImageName}`);
-  if (existsSync('/workspace/final_image_uri.txt')) {
+
+  // If an output file path was provided via command-line, write the final image URI to it.
+  if (argv.outputFile) {
+    console.log(
+      `Writing final image URI for CI artifact to: ${argv.outputFile}`,
+    );
     // The publish step only supports one image. If we build multiple, only the last one
-    // will be published. Throw an error to make this failure explicit.
+    // will be published. Throw an error to make this failure explicit if the file already exists.
+    if (existsSync(argv.outputFile)) {
       throw new Error(
-      'CI artifact file /workspace/final_image_uri.txt already exists. Refusing to overwrite.',
+        `CI artifact file ${argv.outputFile} already exists. Refusing to overwrite.`,
       );
     }
-  writeFileSync('/workspace/final_image_uri.txt', finalImageName);
+    writeFileSync(argv.outputFile, finalImageName);
+  }
 }
 
 if (baseImage && baseDockerfile) {