Create new GH action to allow sonar analysis on fork

- After the maven verify action, the ID of the PR is saved to a file.
- A new action checkout the PR's branch to run the analysis.

.github/workflows/build_sonar_verify.yml

@@ -1,20 +1,52 @@
 # This action launches an analysis on sonarcloud only for PR made from the repository and on master branch.
 name: Sonar verify
 on:
-  push:
-    branches:
-      - master
-  pull_request:
-    types: [opened, synchronize, reopened]
+  workflow_run:
+    workflows: [Maven verify]
+    types: [completed]
 jobs:
-  build:
-    if: ${{ github.repository == 'mivek/MetarParser' && github.actor != 'dependabot[bot]' }} # Sonar build needs secrets in the repository
-    name: Build
+  sonar_pr:
+    if: ${{ github.event.workflow_run.conclusion == 'success' && github.event.workflow_run.event == 'pull_request' }}
     runs-on: ubuntu-latest
     steps:
+      - name: Download PR artifact
+        uses: dawidd6/action-download-artifact@v2
+        with:
+          workflow: Maven verify
+          run_id: ${{ github.event.workflow_run.id }}
+          name: PR_NUMBER
+
+      - name: Read PR_NUMBER.txt
+        id: pr_number
+        uses: juliangruber/read-file-action@v1
+        with:
+          path: ./PR_NUMBER.txt
+
+      - name: Request GitHub API for PR data
+        uses: octokit/[email protected]
+        id: get_pr_data
+        with:
+          route: GET /repos/{full_name}/pulls/{number}
+          number: ${{ steps.pr_number.outputs.content }}
+          full_name: ${{ github.event.repository.full_name }}
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+
       - uses: actions/checkout@v3
         with:
-          fetch-depth: 0  # Shallow clones should be disabled for a better relevancy of analysis
+          fetch-depth: 0
+          repository: ${{ github.event.workflow_run.head_repository.full_name }}
+          ref: ${{ github.event.workflow_run.head_branch }}
+
+      - name: Checkout base branch
+        if: github.event.workflow_run.event == 'pull_request'
+        run: |
+          git remote add upstream ${{ github.event.repository.clone_url }}
+          git fetch upstream
+          git checkout -B ${{ fromJson(steps.get_pr_data.outputs.data).base.ref }} upstream/${{ fromJson(steps.get_pr_data.outputs.data).base.ref }}
+          git checkout ${{ github.event.workflow_run.head_branch }}
+          git clean -ffdx && git reset --hard HEAD
+
       - name: Set up JDK 17
         uses: actions/setup-java@v3
         with:
@@ -33,8 +65,31 @@ jobs:
           path: ~/.m2
           key: ${{ runner.os }}-m2-${{ hashFiles('**/pom.xml') }}
           restore-keys: ${{ runner.os }}-m2
-      - name: Build and analyze
+      - name: Sonar analysis
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+          SONAR_TOKEN: ${{ secrets.SONAR_TOKEN }}
+        run: mvn -B verify org.sonarsource.scanner.maven:sonar-maven-plugin:sonar -Dsonar.scm.revision=${{ github.event.workflow_run.head_sha }} -Dsonar.pullrequest.key=${{ fromJson(steps.get_pr_data.outputs.data).number }} -Dsonar.pullrequest.branch=${{ fromJson(steps.get_pr_data.outputs.data).head.ref }} -Dsonar.pullrequest.base=${{ fromJson(steps.get_pr_data.outputs.data).base.ref }} -Dsonar.projectKey=io.github.mivek:metarParser
+
+  sonar_push:
+    runs-on: ubuntu-latest
+    if: ${{ github.event.workflow_run.conclusion == 'success' && github.event.workflow_run.event == 'push' && github.event.workflow_run.head_repository.full_name == github.event.repository.full_name }}
+    steps:
+      - uses: actions/checkout@v3
+        with:
+          repository: ${{ github.event.workflow_run.head_repository.full_name }}
+          ref: ${{ github.event.workflow_run.head_branch }}
+          fetch-depth: 0
+
+      - name: Set up JDK 17
+        uses: actions/setup-java@v3
+        with:
+          java-version: '17'
+          distribution: 'adopt'
+          cache: 'maven'
+
+      - name: Sonar analysis
         env:
-          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}  # Needed to get PR information, if any
           SONAR_TOKEN: ${{ secrets.SONAR_TOKEN }}
-        run: mvn -B verify org.sonarsource.scanner.maven:sonar-maven-plugin:sonar
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+        run: mvn -B verify org.sonarsource.scanner.maven:sonar-maven-plugin:sonar -Dsonar.projectKey=io.github.mivek:metarParser -Dsonar.scm.revision=${{ github.event.workflow_run.head_sha }} -Dsonar.branch.name=${{ github.event.workflow_run.head_branch }}

.github/workflows/maven-verify.yml

@@ -24,3 +24,12 @@ jobs:
           restore-keys: ${{ runner.os }}-m2
       - name: Run the maven verify
         run: mvn --batch-mode --update-snapshots clean verify
+
+      - name: Save the PR number in a file
+        run: echo ${{ github.event.number }} > PR_NUMBER.txt
+
+      - name: Upload the PR number as an artifact
+        uses: action/upload-artifact@v3
+        with:
+          name: PR_NUMBER
+          path: PR_NUMBER.txt