chore: Add maven clirr check

.github/workflows/ci.yaml

@@ -5,6 +5,23 @@ on:
   pull_request:
 name: ci
 jobs:
+  clirr:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v3
+      - uses: actions/setup-java@v3
+        with:
+          distribution: temurin
+          java-version: 8
+      - run: echo "JAVA8_HOME=${JAVA_HOME}" >> $GITHUB_ENV
+      - uses: actions/setup-java@v3
+        with:
+          distribution: temurin
+          java-version: 11
+      - run: echo "JAVA11_HOME=${JAVA_HOME}" >> $GITHUB_ENV
+      - run: .kokoro/maven-build.sh
+        env:
+          JOB_TYPE: clirr
   maven-units:
     name: "maven unit tests"
     runs-on: ubuntu-latest

.kokoro/maven-build.sh

@@ -37,16 +37,13 @@ fi
 echo "Compiling using Java:"
 java -version
 echo
-mvn -V -B -ntp clean install
+mvn -V -B -ntp clean install -DskipTests -Dclirr.skip=true -Denforcer.skip=true
 
 # We ensure the generated class files are compatible with Java 8
 if [ ! -z "${JAVA8_HOME}" ]; then
   setJava "${JAVA8_HOME}"
 fi
 
-echo "Running tests using Java:"
-java -version
-
 if [ "${GITHUB_JOB}" == "units-java8" ]; then
   java -version 2>&1 | grep -q 'openjdk version "1.8.'
   MATCH=$? # 0 if the output has the match
@@ -56,6 +53,20 @@ if [ "${GITHUB_JOB}" == "units-java8" ]; then
   fi
 fi
 
-echo
-# run tests in Java 8 with the source compiled in Java 11
-mvn -V -B -ntp surefire:test
+RETURN_CODE=0
+
+case "${JOB_TYPE}" in
+test)
+  # run tests in Java 8 with the source compiled in Java 11
+  mvn -V -B -ntp surefire:test -Dclirr.skip=true -Denforcer.skip=true
+  RETURN_CODE=$?
+  ;;
+clirr)
+  mvn -B -ntp -Denforcer.skip=true clirr:check
+  RETURN_CODE=$?
+  ;;
+*) ;;
+esac
+
+echo "exiting with ${RETURN_CODE}"
+exit ${RETURN_CODE}