Add build.yml

.github/workflows/build.yml

@@ -0,0 +1,33 @@
+name: Build plugin
+
+on:
+  push:
+  workflow_dispatch:
+
+jobs:
+  build-plugin:
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout Repository
+        uses: actions/checkout@v2
+
+      - name: Cache Gradle dependencies
+        uses: actions/cache@v2
+        with:
+          path: ~/.gradle
+          key: ${{ runner.os }}-gradle-${{ hashFiles('**/*.gradle*', '**/gradle-wrapper.properties') }}
+          restore-keys: |
+            ${{ runner.os }}-gradle-
+
+      - name: Setup Java
+        uses: actions/setup-java@v2
+        with:
+          distribution: 'adopt'
+          java-version: '21'
+
+      - name: Modify gradlew permissions
+        run: chmod +x ./gradlew
+
+      - name: Build plugin
+        run: ./gradlew shadowJar