add github actions

Author: alexcheng1982

.github/FUNDING.yml

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+ko_fi: alexcheng1982
+github: alexcheng1982

.github/workflows/build.yaml

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+name: build
+
+on:
+  push:
+    branches: [ main ]
+  pull_request:
+    branches: [ main ]
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+
+    steps:
+      - uses: actions/checkout@v4
+      - name: Set up JDK
+        uses: actions/setup-java@v3
+        with:
+          java-version: "21"
+          distribution: "temurin"
+          cache: maven
+      - name: Build with Maven
+        env:
+          OPENAI_API_KEY: ${{ secrets.OPENAI_API_KEY }}
+        run: mvn --batch-mode --update-snapshots package

.github/workflows/publish.yaml

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+name: Publish package to the Maven Central Repository
+on:
+  release:
+    types: [ created ]
+jobs:
+  publish:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - name: Set up Maven Central Repository
+        uses: actions/setup-java@v3
+        with:
+          java-version: '21'
+          distribution: 'temurin'
+          server-id: ossrh
+          server-username: MAVEN_USERNAME
+          server-password: MAVEN_PASSWORD
+          gpg-private-key: ${{ secrets.MAVEN_GPG_PRIVATE_KEY }}
+          gpg-passphrase: MAVEN_GPG_PASSPHRASE
+      - name: Publish package
+        run: mvn --batch-mode deploy
+        env:
+          OPENAI_API_KEY: ${{ secrets.OPENAI_API_KEY }}
+          MAVEN_USERNAME: ${{ secrets.OSSRH_USERNAME }}
+          MAVEN_PASSWORD: ${{ secrets.OSSRH_TOKEN }}
+          MAVEN_GPG_PASSPHRASE: ${{ secrets.MAVEN_GPG_PASSPHRASE }}