add: maven cache

Signed-off-by: Daniel Nägele <info@naegele.dev>

.github/workflows/java-ci-release.yaml

@@ -1,23 +0,0 @@
-name: Java CI add binary
-
-on:
-  release:
-    types: [published]
-
-jobs:
-  build:
-    runs-on: ubuntu-latest
-
-    steps:
-      - uses: actions/checkout@v3
-      - name: Set up JDK 17
-        uses: actions/setup-java@v3
-        with:
-          java-version: '17'
-          distribution: 'adopt'
-      - name: Build with Maven
-        run: mvn --batch-mode --update-snapshots package
-      - uses: AButler/upload-release-assets@v2.0
-        with:
-          files: 'missilewars-plugins/target/MissileWars-*.jar;'
-          repo-token: ${{ secrets.GITHUB_TOKEN }}

.github/workflows/java-ci.yaml

@@ -14,5 +14,6 @@ jobs:
         with:
           java-version: '17'
           distribution: 'adopt'
+          cache: 'maven'
       - name: Build with Maven
         run: mvn --batch-mode --update-snapshots package