Matrix os build (#3341)

Author: Vladimir Kotal

.github/workflows/build.yml

@@ -4,37 +4,12 @@ on: [push, pull_request]
 
 jobs:
   ubuntu:
-    name: Ubuntu with Java 11
-    runs-on: ubuntu-latest
-    steps:
-    - name: Checkout master branch
-      uses: actions/checkout@v2
-    - name: Set up JDK 11
-      uses: actions/setup-java@v1
-      with:
-        java-version: 11
-    - name: Cache Maven packages
-      uses: actions/cache@v2
-      with:
-        path: ~/.m2
-        key: ${{ runner.os }}-m2-${{ hashFiles('**/pom.xml') }}
-        restore-keys: ${{ runner.os }}-m2
-    - name: Install pre-requisites
-      run: ./dev/before_install
-    - name: Before build actions
-      run: ./dev/before
-    - name: Build
-      env:
-        OPENGROK_PULL_REQUEST: ${{ github.head_ref }}
-        OPENGROK_REPO_SLUG: ${{ github.repository }}
-        OPENGROK_REF: ${{ github.ref }}
-        OPENGROK_COVERALLS_TOKEN: ${{ secrets.COVERALLS_TOKEN }}
-        OPENGROK_SONAR_TOKEN: ${{ secrets.SONAR_TOKEN }}
-        GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
-      run: ./dev/main
-  macos:
-    name: macOS with Java 11
-    runs-on: macos-latest
+    name: ${{ matrix.os }} with Java 11
+    runs-on: ${{ matrix.os }}
+    strategy:
+      fail-fast: false
+      matrix:
+        os: [ubuntu-latest, macos-latest, windows-latest]
     steps:
     - name: Checkout master branch
       uses: actions/checkout@v2
@@ -50,34 +25,23 @@ jobs:
         restore-keys: ${{ runner.os }}-m2
     - name: Install pre-requisites
       run: ./dev/before_install
+      if: runner.os == 'Linux' || runner.os == 'macOS'
+    - name: Install Universal ctags (Windows)
+      run: choco install universal-ctags
+      if: runner.os == 'Windows'
     - name: Before build actions
       run: ./dev/before
-    - name: Build
+      if: runner.os == 'Linux' || runner.os == 'macOS'
+    - name: Unix build
       env:
         OPENGROK_PULL_REQUEST: ${{ github.head_ref }}
         OPENGROK_REPO_SLUG: ${{ github.repository }}
         OPENGROK_REF: ${{ github.ref }}
         OPENGROK_COVERALLS_TOKEN: ${{ secrets.COVERALLS_TOKEN }}
         OPENGROK_SONAR_TOKEN: ${{ secrets.SONAR_TOKEN }}
         GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+      if: runner.os == 'Linux' || runner.os == 'macOS'
       run: ./dev/main
-  windows:
-    name: Windows with Java 11
-    runs-on: windows-latest
-    steps:
-    - name: Checkout master branch
-      uses: actions/checkout@v2
-    - name: Set up JDK 11
-      uses: actions/setup-java@v1
-      with:
-        java-version: 11
-    - name: Cache Maven packages
-      uses: actions/cache@v2
-      with:
-        path: ~/.m2
-        key: ${{ runner.os }}-m2-${{ hashFiles('**/pom.xml') }}
-        restore-keys: ${{ runner.os }}-m2
-    - name: Install Universal ctags
-      run: choco install universal-ctags
-    - name: Build
+    - name: Windows build
       run: mvn -B -V verify
+      if: runner.os == 'Windows'