build(python): switch to keystore for publication (GoogleCloudPlatform#249)

Author: parthea

.kokoro/release.sh

@@ -22,7 +22,7 @@ python3 -m pip install --upgrade twine wheel setuptools
 export PYTHONUNBUFFERED=1
 
 # Move into the package, build the distribution and upload.
-TWINE_PASSWORD=$(cat "${KOKORO_GFILE_DIR}/secret_manager/google-cloud-pypi-token")
+TWINE_PASSWORD=$(cat "${KOKORO_KEYSTORE_DIR}/73713_google-cloud-pypi-token-keystore-1")
 cd github/cloud-sql-python-connector
 python3 setup.py sdist bdist_wheel
-twine upload --username __token__ --password "${TWINE_PASSWORD}" dist/*
+twine upload --username __token__ --password "${TWINE_PASSWORD}" dist/*

.kokoro/release/common.cfg

@@ -36,8 +36,12 @@ env_vars: {
     value: "github/cloud-sql-python-connector/.kokoro/release.sh"
 }
 
-# Tokens needed to report release status back to GitHub
-env_vars: {
-  key: "SECRET_MANAGER_KEYS"
-  value: "google-cloud-pypi-token"
-}
+# Fetch PyPI password
+before_action {
+  fetch_keystore {
+    keystore_resource {
+      keystore_config_id: 73713
+      keyname: "google-cloud-pypi-token-keystore-1"
+    }
+  }
+}