[Better Tests] Add GCE metadata emulator worker/uworker configs

test_suites/seed/gce_metadata_server/template.json

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+{
+  // Reference metadata emulator config. Copy this file to create a fixture,
+  // stripping "//" comments so standard encoding/json can parse it.
+  //
+  // The shape of "metadata" mirrors the GCE metadata server's hierarchy:
+  //
+  //   curl -H 'Metadata-Flavor: Google' \
+  //     'http://metadata.google.internal/computeMetadata/v1/?recursive=true' \
+  //     | jq
+
+  "credentials": {
+    // Identity and token reported under instance/service-accounts/.
+    // No network, no gcloud, no real credentials.
+    "email": "",
+    "scopes": [],
+    "access_token": "",
+    "expires_in_seconds": 3600
+  },
+
+  "host": {
+    "interface": "127.0.0.1"
+  },
+
+  "metadata": {
+    "project": {
+      "project-id": "",
+      "numeric-project-id": "",
+
+      // Project-wide custom metadata, served under project/attributes/<key>.
+      // Applies to every instance in the project.
+      "attributes": {
+        "deployment-bucket": "test-deployment"
+      }
+    },
+
+    "instance": {
+      "id": "",
+      "hostname": "",
+
+      // Write the zone the way the real metadata server does: as a full
+      // resource path, not just the zone name.
+      //
+      //   do this:      "projects/1234567890/zones/us-central1-f"
+      //   not this:     "us-central1-f"
+      "zone": "",
+
+      "machine-type": "",
+      "preempted": "FALSE",
+      "scheduling": {
+        "preemptible": "FALSE",
+        "provisioning-model": "STANDARD"
+      },
+
+      // Per-instance custom metadata, served under instance/attributes/<key>.
+      // An instance attribute shadows a project attribute of the same name. If
+      // neither scope defines the key the server returns 404, which some
+      // callers treat as a meaningful answer rather than an error.
+      "attributes": {
+        "override_tworker_queue": "jobs-linux-test"
+      }
+    }
+  }
+}

test_suites/seed/gce_metadata_server/tworker.json

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+{
+  "credentials": {
+    "email": "test-clusterfuzz-service-account-email",
+    "scopes": [
+      "https://www.googleapis.com/auth/cloud-platform",
+      "https://www.googleapis.com/auth/userinfo.email"
+    ],
+    "access_token": "fake-tworker-access-token",
+    "expires_in_seconds": 3600
+  },
+  "host": {
+    "interface": "127.0.0.1"
+  },
+  "metadata": {
+    "project": {
+      "project-id": "test-clusterfuzz",
+      "numeric-project-id": "1234567890",
+      "attributes": {
+        "deployment-bucket": "test-deployment-bucket",
+        "deployment-zip": "linux-3.zip"
+      }
+    },
+    "instance": {
+      "id": "1111111111111111111",
+      "hostname": "tworker-1.c.test-clusterfuzz.internal",
+      "zone": "projects/1234567890/zones/us-central1-f",
+      "preempted": "FALSE",
+      "scheduling": {
+        "preemptible": "FALSE",
+        "provisioning-model": "STANDARD"
+      },
+      "attributes": {
+        "override_tworker_queue": "jobs-linux-test"
+      }
+    }
+  }
+}

test_suites/seed/gce_metadata_server/uworker.json

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+{
+  "credentials": {
+    "email": "test-unpriv-clusterfuzz-service-account-email",
+    "scopes": ["https://www.googleapis.com/auth/cloud-platform"],
+    "access_token": "fake-uworker-access-token",
+    "expires_in_seconds": 3600
+  },
+  "host": {
+    "interface": "127.0.0.1"
+  },
+  "metadata": {
+    "project": {
+      "project-id": "test-clusterfuzz",
+      "numeric-project-id": "1234567890",
+      "attributes": {
+        "deployment-bucket": "test-deployment-bucket",
+        "deployment-zip": "linux-3.zip"
+      }
+    },
+    "instance": {
+      "id": "2222222222222222222",
+      "hostname": "uworker-1.c.test-clusterfuzz.internal",
+      "zone": "projects/1234567890/zones/us-central1-f",
+      "preempted": "FALSE",
+      "scheduling": {
+        "preemptible": "FALSE",
+        "provisioning-model": "STANDARD"
+      },
+      "attributes": {}
+    }
+  }
+}