Configure issue reviver to run with Kokoro

PiperOrigin-RevId: 288921032

kokoro/issue_reviver.cfg

@@ -0,0 +1,15 @@
+build_file: "repo/scripts/issue_reviver.sh"
+
+before_action {
+  fetch_keystore {
+    keystore_resource {
+      keystore_config_id: 73898
+      keyname: "kokoro-github-access-token"
+    }
+  }
+}
+
+env_vars {
+  key: "KOKORO_GITHUB_ACCESS_TOKEN"
+  value: "73898_kokoro-github-access-token"
+}

scripts/issue_reviver.sh

@@ -0,0 +1,27 @@
+#!/bin/bash
+
+# Copyright 2019 The gVisor Authors.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+DIR=$(dirname $0)
+source "${DIR}"/common.sh
+
+# Provide a credential file if available.
+export OAUTH_TOKEN_FILE=""
+if [[ -v KOKORO_GITHUB_ACCESS_TOKEN ]]; then
+  OAUTH_TOKEN_FILE="${KOKORO_KEYSTORE_DIR}/${KOKORO_GITHUB_ACCESS_TOKEN}"
+fi
+
+REPO_ROOT=$(cd "$(dirname "${DIR}")"; pwd)
+run //tools/issue_reviver:issue_reviver --path "${REPO_ROOT}" --oauth-token-file="${OAUTH_TOKEN_FILE}"