ci: create GitHub Actions workflow for automated release

.github/workflows/deploy.yml

@@ -0,0 +1,40 @@
+name: Release
+on:
+  push:
+    tags:
+      - v*
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v2
+      - name: Set up JDK 11
+        uses: actions/setup-java@v2
+        with:
+          java-version: 11
+          distribution: 'adopt'
+      - name: Update Gradle Wrapper Action
+        uses: gradle-update/update-gradle-wrapper-action@v1
+      - name: Build with Gradle
+        run: ./gradlew build
+      - name: Create release
+        id: create_release
+        uses: actions/create-release@v1
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+        with:
+          tag_name: ${{ github.ref }}
+          release_name: Release ${{ github.ref }}
+          body: Automated release created by GitHub Actions.
+          draft: false
+          prerelease: false
+      - name: Upload release asset
+        uses: actions/upload-release-asset@v1
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+        with:
+          upload_url: ${{ steps.create_release.outputs.upload_url }}
+          asset_path: ./build/libs/kotlib-all.jar
+          asset_name: kotlib-all.jar
+          asset_content_type: application/java-archive