chore: add OwlBot as a required check (#891)

* chore: add OwlBot as a required check

* 🦉 Updates from OwlBot post-processor

See https://github.com/googleapis/repo-automation-bots/blob/main/packages/owl-bot/README.md

* add replacement in owlbot.py to customize .kokoro/build.sh

Co-authored-by: Owl Bot <gcf-owl-bot[bot]@users.noreply.github.com>

.github/sync-repo-settings.yaml

@@ -10,6 +10,7 @@ branchProtectionRules:
     - 'Kokoro'
     - 'cla/google'
     - 'Kokoro system-3.8'
+    - 'OwlBot Post Processor'
 - pattern: python2
   requiresCodeOwnerReviews: true
   requiresStrictStatusChecks: true

.kokoro/build.sh

@@ -24,15 +24,6 @@ cd "${PROJECT_ROOT}"
 # Disable buffering, so that the logs stream through.
 export PYTHONUNBUFFERED=1
 
-# Debug: show build environment
-env | grep KOKORO
-
-# Setup service account credentials.
-export GOOGLE_APPLICATION_CREDENTIALS=${KOKORO_GFILE_DIR}/service-account.json
-
-# Setup project id.
-export PROJECT_ID=$(cat "${KOKORO_GFILE_DIR}/project-id.json")
-
 # Export variable to override api endpoint
 export API_ENDPOINT_OVERRIDE
 
@@ -43,6 +34,15 @@ export API_VERSION_OVERRIDE
 export DUAL_REGION_LOC_1
 export DUAL_REGION_LOC_2
 
+# Debug: show build environment
+env | grep KOKORO
+
+# Setup service account credentials.
+export GOOGLE_APPLICATION_CREDENTIALS=${KOKORO_GFILE_DIR}/service-account.json
+
+# Setup project id.
+export PROJECT_ID=$(cat "${KOKORO_GFILE_DIR}/project-id.json")
+
 # Remove old nox
 python3 -m pip uninstall --yes --quiet nox-automation
 

owlbot.py

@@ -52,6 +52,21 @@
     ],
 )
 
+s.replace(
+    ".kokoro/build.sh",
+    "export PYTHONUNBUFFERED=1",
+    """export PYTHONUNBUFFERED=1
+
+# Export variable to override api endpoint
+export API_ENDPOINT_OVERRIDE
+
+# Export variable to override api endpoint version
+export API_VERSION_OVERRIDE
+
+# Export dual region locations
+export DUAL_REGION_LOC_1
+export DUAL_REGION_LOC_2""")
+
 python.py_samples(skip_readmes=True)
 
 s.shell.run(["nox", "-s", "blacken"], hide_output=False)