specify artifact retention and compression level in workflow

.gitea/workflows/gradle.yml

@@ -8,7 +8,6 @@ on:
 
 jobs:
   build:
-
     runs-on: archlinux-latest
     permissions:
       contents: read
@@ -23,8 +22,8 @@ jobs:
       - name: Set up JDK 21
         uses: actions/setup-java@v4
         with:
-          java-version: '21'
-          distribution: 'temurin'
+          java-version: "21"
+          distribution: "temurin"
 
       - name: Setup Gradle
         uses: gradle/actions/setup-gradle@v4
@@ -37,3 +36,5 @@ jobs:
         with:
           name: JARs
           path: build/libs
+          retention-days: 30
+          compression-level: 9