ci: configure the protected branch

.github/workflows/ci.yaml

@@ -1,74 +1,110 @@
-on:
+'on':
   push:
     paths-ignore:
-      - 'tutorials/**'
+      - tutorials/**
     branches:
-    - main
-  pull_request:
+      - 2.38.x
+  pull_request: null
 name: ci
 jobs:
   units:
     runs-on: ubuntu-latest
     strategy:
       fail-fast: false
       matrix:
-        java: [8, 11, 17]
+        java:
+          - 11
+          - 17
     steps:
-    - uses: actions/checkout@v3
-    - uses: actions/setup-java@v2
-      with:
-        distribution: zulu
-        java-version: ${{matrix.java}}
-    - run: java -version
-    - run: .kokoro/build.sh
-      env:
-        JOB_TYPE: test
+      - uses: actions/checkout@v3
+      - uses: actions/setup-java@v2
+        with:
+          distribution: temurin
+          java-version: ${{matrix.java}}
+      - run: java -version
+      - run: .kokoro/build.sh
+        env:
+          JOB_TYPE: test
+  units-java8:
+    name: units (8)
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v3
+      - uses: actions/setup-java@v3
+        with:
+          java-version: 8
+          distribution: zulu
+      - name: >-
+          Set jvm system property environment variable for surefire plugin (unit
+          tests)
+        run: echo "SUREFIRE_JVM_OPT=-Djvm=${JAVA_HOME}/bin/java" >> $GITHUB_ENV
+        shell: bash
+      - uses: actions/setup-java@v3
+        with:
+          java-version: 17
+          distribution: zulu
+      - run: .kokoro/build.sh
+        env:
+          JOB_TYPE: test
   windows:
     runs-on: windows-latest
     steps:
-    - uses: actions/checkout@v3
-    - uses: actions/setup-java@v2
-      with:
-        distribution: zulu
-        java-version: 8
-    - run: java -version
-    - run: .kokoro/build.bat
-      env:
-        JOB_TYPE: test
+      - uses: actions/checkout@v3
+      - uses: actions/setup-java@v2
+        with:
+          distribution: temurin
+          java-version: 8
+      - run: java -version
+      - run: .kokoro/build.bat
+        env:
+          JOB_TYPE: test
   dependencies:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        java: [8, 11, 17]
+        java:
+          - 17
+    steps:
+      - uses: actions/checkout@v3
+      - uses: actions/setup-java@v2
+        with:
+          distribution: temurin
+          java-version: ${{matrix.java}}
+      - run: java -version
+      - run: .kokoro/dependencies.sh
+  javadoc:
+    runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@v3
-    - uses: actions/setup-java@v2
-      with:
-        distribution: zulu
-        java-version: ${{matrix.java}}
-    - run: java -version
-    - run: .kokoro/dependencies.sh
+      - uses: actions/checkout@v3
+      - uses: actions/setup-java@v3
+        with:
+          distribution: temurin
+          java-version: 17
+      - run: java -version
+      - run: .kokoro/build.sh
+        env:
+          JOB_TYPE: javadoc
   lint:
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@v3
-    - uses: actions/setup-java@v2
-      with:
-        distribution: zulu
-        java-version: 11
-    - run: java -version
-    - run: .kokoro/build.sh
-      env:
-        JOB_TYPE: lint
+      - uses: actions/checkout@v3
+      - uses: actions/setup-java@v2
+        with:
+          distribution: temurin
+          java-version: 11
+      - run: java -version
+      - run: .kokoro/build.sh
+        env:
+          JOB_TYPE: lint
   clirr:
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@v3
-    - uses: actions/setup-java@v2
-      with:
-        distribution: zulu
-        java-version: 8
-    - run: java -version
-    - run: .kokoro/build.sh
-      env:
-        JOB_TYPE: clirr
+      - uses: actions/checkout@v3
+      - uses: actions/setup-java@v2
+        with:
+          distribution: temurin
+          java-version: 8
+      - run: java -version
+      - run: .kokoro/build.sh
+        env:
+          JOB_TYPE: clirr