💚 Implemented GitHub CI for building Jar and Docker image

.github/workflows/build.yml

@@ -0,0 +1,90 @@
+name: Java CI
+
+on:
+  push:
+    branches:
+      - "**"
+    tags:
+      - "v*.*.*"
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+
+    steps:
+      - uses: actions/checkout@v3
+
+      - name: Set up JDK 21
+        uses: actions/setup-java@v3
+        with:
+          java-version: '21'
+          distribution: 'adopt'
+
+      - name: Run chmod to make gradlew executable
+        run: chmod +x ./gradlew
+
+      - name: Validate Gradle wrapper
+        uses: gradle/wrapper-validation-action@e6e38bacfdf1a337459f332974bb2327a31aaf4b
+
+      - name: Build with Gradle Shadowjar
+        uses: gradle/gradle-build-action@67421db6bd0bf253fb4bd25b31ebb98943c375e1
+        with:
+          arguments: shadowJar
+
+      - name: 'Yiski: a devOS discord bot'
+        uses: actions/upload-artifact@v3
+        with:
+          name: Yiski
+          path: build/libs/yiski-all.jar
+
+  docker:
+    runs-on: ubuntu-latest
+
+    needs: build
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v3
+
+      - name: 'Download artifact of built jar'
+        uses: actions/download-artifact@v3
+        with:
+          name: Yiski
+
+      - name: Docker meta
+        id: meta
+        uses: docker/metadata-action@v4
+        with:
+          # list of Docker images to use as base name for tags
+          images: |
+            ghcr.io/devOS-Sanity-Edition/yiski
+          # generate Docker tags based on the following events/attributes
+          tags: |
+            type=schedule
+            type=ref,event=branch
+            type=ref,event=pr
+            type=semver,pattern={{version}}
+            type=semver,pattern={{major}}.{{minor}}
+            type=semver,pattern={{major}}
+            type=sha
+
+      - name: Set up QEMU
+        uses: docker/setup-qemu-action@v2
+
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v2
+
+      - name: Login to GitHub Container Registry
+        uses: docker/login-action@v2
+        with:
+          registry: ghcr.io
+          username: ${{ github.actor }}
+          password: ${{ secrets.GITHUB_TOKEN }}
+
+      - name: Build and push
+        uses: docker/build-push-action@v3
+        with:
+          context: .
+          platforms: linux/amd64,linux/arm64
+          push: ${{ github.event_name != 'pull_request' }}
+          tags: ${{ steps.meta.outputs.tags }}
+          labels: ${{ steps.meta.outputs.labels }}