ci: update github workflow

we aren't going to deploy using github anymore

.github/workflows/build.yml

@@ -5,16 +5,17 @@ jobs:
   build:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v3
-      - uses: actions/setup-java@v3
+      - name: Checkout sources
+        uses: actions/checkout@v4
+      - name: Setup Java
+        uses: actions/setup-java@v4
         with:
           distribution: temurin
-          java-version: 17
-      - name: Compile the source code
-        uses: gradle/gradle-build-action@v2
-        with:
-          gradle-version: current
-          arguments: build
+          java-version: 21
+      - name: Setup Gradle
+        uses: gradle/actions/setup-gradle@v4
+      - name: Build with Gradle
+        run: ./gradlew build
       - name: Upload build artifacts
         uses: actions/upload-artifact@v3
         with:

.github/workflows/main.yml

@@ -0,0 +1,9 @@
+name: Build changes on main
+on:
+  push:
+    branches:
+      - main
+
+jobs:
+  build:
+    uses: sandrabot/sandra/.github/workflows/build.yml@main