DEVOPS: add github package deploy

.github/workflows/build_mainline.yml

@@ -1,9 +1,8 @@
-name: Build [mainline]
+  name: Build [mainline]
 on:
   push:
     branches:
       - main
-      - main_**
 
 jobs:
   build:
@@ -15,9 +14,10 @@ jobs:
 
     steps:
       - uses: actions/checkout@v4
+        env:
+          GITHUB_TOKEN: ${{ secrets.REPO_TOKEN }}  # Needed to get PR information, if any
         with:
           ref: ${{ github.head_ref }}
-          token: ${{ secrets.REPO_TOKEN }}
 
       - name: Set up JDK 21
         uses: actions/setup-java@v4

.github/workflows/release.yml

@@ -0,0 +1,20 @@
+name: Publish package to GitHub Packages
+on:
+  release:
+    types: [created]
+jobs:
+  publish:
+    runs-on: ubuntu-latest
+    permissions:
+      contents: read
+      packages: write
+    steps:
+      - uses: actions/checkout@v4
+      - uses: actions/setup-java@v4
+        with:
+          java-version: '21'
+          distribution: 'temurin'
+      - name: Publish package
+        run: mvn --batch-mode deploy
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}