GitHub Action to publish to Maven Central (#17)

* Create maven-publish.yml

* Update maven-publish.yml

* Update maven-publish.yml

* Update maven-publish.yml

.github/workflows/maven-publish.yml

@@ -0,0 +1,21 @@
+name: Publish package to the Maven Central Repository
+on:
+  release:
+    types: [created]
+jobs:
+  publish:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+      - name: Set up JDK 1.8
+        uses: actions/setup-java@v1
+        with:
+          java-version: 1.8
+      - name: Publish to Maven Central
+        uses: samuelmeuli/action-maven-publish@v1.4.0
+        with:
+          gpg_private_key: ${{ secrets.GPG_PRIVATE_KEY }}
+          gpg_passphrase: ${{ secrets.GPG_PASSPHRASE }}
+          nexus_username: ${{ secrets.OSSRH_USERNAME }}
+          nexus_password: ${{ secrets.OSSRH_TOKEN }}
+          server_id: ossrh