Fix build workflow for forks (#115)

Author: utarwyn

.github/workflows/build.yml

@@ -5,12 +5,12 @@ on:
     branches:
       - main
     paths-ignore:
-      - '*.md'
-      - '.github/**/*.yml'
+      - "*.md"
+      - ".github/**/*.yml"
     tags:
-      - '[0-9]+.[0-9]+.[0-9]+'
+      - "[0-9]+.[0-9]+.[0-9]+"
   pull_request:
-    types: [ opened, synchronize, reopened ]
+    types: [opened, synchronize, reopened]
 
 jobs:
   build:
@@ -22,32 +22,27 @@ jobs:
       - name: Checkout
         uses: actions/checkout@v4
         with:
-          fetch-depth: 0  # Shallow clones should be disabled for a better relevancy of analysis
+          fetch-depth: 0 # Shallow clones should be disabled for a better relevancy of analysis
 
       - name: Set up JDK 17
-        uses: actions/setup-java@v3
+        uses: actions/setup-java@v4
         with:
-          distribution: 'temurin'
+          distribution: "temurin"
           java-version: 17
-
-      - name: Cache Maven packages
-        uses: actions/cache@v3
-        with:
-          path: ~/.m2
-          key: ${{ runner.os }}-m2-${{ hashFiles('**/pom.xml') }}
-          restore-keys: ${{ runner.os }}-m2
+          cache: maven
 
       - name: Verify
         run: ./mvnw -e -B verify
 
       - name: Cache SonarQube packages
-        uses: actions/cache@v3
+        uses: actions/cache@v4
         with:
           path: ~/.sonar/cache
           key: ${{ runner.os }}-sonar
           restore-keys: ${{ runner.os }}-sonar
 
       - name: SonarQube Scan
+        if: github.event_name != 'pull_request' || github.event.pull_request.head.repo.full_name == github.repository
         env:
           GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
           SONAR_TOKEN: ${{ secrets.SONAR_TOKEN }}