Enable build on GitHub Actions

.github/workflows/build.yml

-name: Build
-on:
-  push:
-    branches:
-      - master
-  pull_request:
-    types: [opened, synchronize, reopened]
-jobs:
-  build:
-    name: Build
-    runs-on: ubuntu-latest
-    steps:
-      - uses: actions/checkout@v2
-        with:
-          fetch-depth: 0  # Shallow clones should be disabled for a better relevancy of analysis
-      - name: Set up JDK 11
-        uses: actions/setup-java@v1
-        with:
-          java-version: 11
-      - name: Cache SonarCloud packages
-        uses: actions/cache@v1
-        with:
-          path: ~/.sonar/cache
-          key: ${{ runner.os }}-sonar
-          restore-keys: ${{ runner.os }}-sonar
-      - name: Cache Maven packages
-        uses: actions/cache@v1
-        with:
-          path: ~/.m2
-          key: ${{ runner.os }}-m2-${{ hashFiles('**/pom.xml') }}
-          restore-keys: ${{ runner.os }}-m2
-      - name: Build and analyze
-        env:
-          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}  # Needed to get PR information, if any
-          SONAR_TOKEN: ${{ secrets.SONAR_TOKEN }}
-        run: mvn -B test org.sonarsource.scanner.maven:sonar-maven-plugin:sonar

.github/workflows/ci-build.yml

+name: GitLab4J CI
+
+on:
+  push:
+    branches-ignore:
+      - 'dependabot/**'
+  pull_request:
+    types: [opened, synchronize, reopened, ready_for_review]
+
+jobs:
+
+  build-jdk8:
+    name: "Build JDK 8"
+    runs-on: ubuntu-latest
+    services:
+      gitlab-instance:
+        image: gitlab/gitlab-ce:12.9.2-ce.0
+        env:
+          GITLAB_OMNIBUS_CONFIG: gitlab_rails['initial_root_password']="password";gitlab_rails['lfs_enabled']=false;
+        ports:
+          - 8090:80
+    steps:
+      - uses: actions/checkout@v2
+        with:
+          fetch-depth: 0
+      - name: Set up JDK 8
+        uses: actions/setup-java@v2
+        with:
+          distribution: adopt-hotspot
+          java-version: 8
+      - name: Get Date
+        id: get-date
+        run: |
+          echo "::set-output name=date::$(/bin/date -u "+%Y-%m")"
+        shell: bash
+      - name: Cache Maven Repository
+        id: cache-maven
+        uses: actions/cache@v2
+        with:
+          path: ~/.m2/repository
+          # refresh cache every month to avoid unlimited growth
+          key: gitlab4jmaven-${{ steps.get-date.outputs.date }}
+      - name: GitLab4j verify
+        id: gitlab4j-verify
+        run: |
+          ./mvnw integration-test -B -V -Dmaven.javadoc.skip=true

.travis.yml

-language: java
-sudo: required
-services:
-  - docker
-jdk:
-  - openjdk8
-install:
-  - ./mvnw install -B -q -Dgpg.skip=true -DskipTests=true -Dmaven.javadoc.skip=true
-before_script:
-  - ./mvnw docker:start -B -Dgitlab.skip-docker-start=false
-script:
-  - ./mvnw integration-test -B -V -Dmaven.javadoc.skip=true
-after_script:
-  - ./mvnw docker:stop -B -Dgitlab.skip-docker-start=false
-after_failure:
-  - ./mvnw docker:stop -B -Dgitlab.skip-docker-start=false