ci: configure the protected branch (#2780)

* ci: configure the protected branch

* chore: generate libraries at Mon Feb  9 21:09:18 UTC 2026

---------

Co-authored-by: cloud-java-bot <cloud-java-bot@google.com>

Author: blakeli0

.github/workflows/conformance.yaml

@@ -1,41 +1,26 @@
-# Copyright 2023 Google LLC
-#
-# 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.
-# Github action job to test core java library features on
-# downstream client libraries before they are released.
-on:
+'on':
   push:
     branches:
-    - main
-  pull_request:
+      - 2.72.x
+  pull_request: null
 name: conformance
 jobs:
   conformance:
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@v4
-    - uses: actions/checkout@v4
-      with:
-        repository: googleapis/cloud-bigtable-clients-test
-        ref: main
-        path: cloud-bigtable-clients-test
-    - uses: actions/setup-java@v4
-      with:
-        distribution: zulu
-        java-version: 8
-    - uses: actions/setup-go@v5
-      with:
-        go-version: '>=1.20.2'
-    - run: java -version
-    - run: go version
-    - run: .kokoro/conformance.sh
+      - uses: actions/checkout@v4
+      - uses: actions/checkout@v4
+        with:
+          repository: googleapis/cloud-bigtable-clients-test
+          ref: main
+          path: cloud-bigtable-clients-test
+      - uses: actions/setup-java@v4
+        with:
+          distribution: zulu
+          java-version: 8
+      - uses: actions/setup-go@v5
+        with:
+          go-version: '>=1.20.2'
+      - run: java -version
+      - run: go version
+      - run: .kokoro/conformance.sh