feat: add build job

Author: Superkooka

.github/workflow/build.yaml

@@ -0,0 +1,51 @@
+name: Build
+
+on:
+  push:
+    tags:
+      - "v*.*.*"
+
+env:
+  REGISTRY: ghcr.io
+  IMAGE_NAME: ${{ github.repository }}
+
+jobs:
+  build:
+    name: Build & Push Docker Image
+    runs-on: ubuntu-latest
+    permissions:
+      contents: read
+      packages: write
+
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Set up JDK 21
+        uses: actions/setup-java@v4
+        with:
+          java-version: "21"
+          distribution: "temurin"
+
+      - name: Setup Gradle
+        uses: gradle/actions/setup-gradle@v4
+
+      - name: Extract tag version
+        id: version
+        run: echo "VERSION=${GITHUB_REF_NAME#v}" >> $GITHUB_OUTPUT
+
+      - name: Log in to GitHub Container Registry
+        uses: docker/login-action@v3
+        with:
+          registry: ${{ env.REGISTRY }}
+          username: ${{ github.actor }}
+          password: ${{ secrets.GITHUB_TOKEN }}
+
+      - name: Build and push image via Jib
+        run: |
+          ./gradlew jib \
+            -Djib.to.image=${{ env.REGISTRY }}/${{ env.IMAGE_NAME }} \
+            -Djib.to.tags=${{ steps.version.outputs.VERSION }},latest \
+            -Djib.to.auth.username=${{ github.actor }} \
+            -Djib.to.auth.password=${{ secrets.GITHUB_TOKEN }} \
+            -Pversion=${{ steps.version.outputs.VERSION }}