feat(ci): add a workflow to publish snapshot

.github/workflows/snapshot.yml

@@ -0,0 +1,31 @@
+name: Publish a snapshot package to Maven Central
+
+on: workflow_dispatch
+
+jobs:
+  publish:
+    runs-on: ubuntu-latest
+    permissions:
+      contents: read
+      packages: write
+    steps:
+      - uses: actions/checkout@v4
+      - name: Set up JDK
+        uses: actions/setup-java@v4
+        with:
+          java-version: '17'
+          distribution: 'adopt'
+      - name: Setup git config (for patch command)
+        run: |
+          git config --global user.name "GitHub Actions Bot"
+          git config --global user.email "<>"
+      - name: Grant execute permission for gradlew
+        run: chmod +x gradlew
+      - name: Publish package
+        run: ./gradlew publish
+        env:
+          MAVEN_USERNAME: ${{ secrets.OSSRH_USERNAME }}
+          MAVEN_PASSWORD: ${{ secrets.OSSRH_TOKEN }}
+          GPG_KEY: ${{ secrets.GPG_KEY }}
+          GPG_KEY_ID: ${{ secrets.GPG_KEY_ID }}
+          GPG_PASSWORD: ${{ secrets.GPG_PASSWORD }}