Setup CI

.github/workflows/build.yml

@@ -0,0 +1,46 @@
+name: Build
+on:
+  push:
+    branches:
+      - master
+  workflow_dispatch:
+    inputs:
+      publish:
+        description: |-
+          Publish to GitHub Packages
+          (The master branch always publish regardless this option.)
+        type: boolean
+        required: true
+        default: false
+jobs:
+  build:
+    name: Build library
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v4
+      - name: Setup JDK8
+        uses: actions/setup-java@v4
+        with:
+          distribution: 'zulu'
+          java-version: '8'
+          cache: gradle
+      - name: Validate Gradle wrapper
+        uses: gradle/actions/wrapper-validation@v3
+      - name: Add permission to Gradle wrapper
+        run: chmod +x gradlew
+      - name: Do build
+        run: ./gradlew build
+      - name: Upload artifact
+        uses: actions/upload-artifact@v4
+        with:
+          path: ./build/libs/*
+          retention-days: 30
+      - name: Publish to GitHub Packages
+        if: ${{ github.ref == 'refs/heads/master' || inputs.publish }}
+        run: ./gradlew publish
+        env:
+          GPR_KEY: ${{ secrets.GITHUB_TOKEN }}
+          SIGNING_KEY: ${{ secrets.GPG_PRIVATE_KEY }}
+          SIGNING_KEY_ID: ${{ secrets.GPG_KEY_ID }}
+          SIGNING_KEY_PASSWORD: ${{ secrets.GPG_PASSPHRASE }}