automating releases to maven central (#8)

See #5

Co-authored-by: Rishabh Arora <rishabh.arora@clevertap.com>

Author: pepop99

.github/workflows/release.yml

@@ -0,0 +1,37 @@
+name: Publish to Maven Central
+
+on:
+  release:
+    types: [published]
+
+jobs:
+  build:
+    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: Cache local Maven repository
+        uses: actions/cache@v2
+        with:
+          path: ~/.m2/repository
+          key: ${{ runner.os }}-maven-${{ hashFiles('**/pom.xml') }}
+          restore-keys: |
+            ${{ runner.os }}-maven-
+      - id: install-secret-key
+        name: Install GPG secret key
+        run: |
+          cat <(echo -e "${{ secrets.GPG_PRIVATE_KEY }}") | gpg --batch --import
+      - name: Deploy
+        run: |
+          mvn -P gpg_verify \
+            --no-transfer-progress \
+            --batch-mode -Dgpg.passphrase=${{ secrets.GPG_PASSPHRASE }} \
+            --file pom.xml -s release/m2-settings.xml verify deploy
+        env:
+          OSSRH_USERNAME: ${{ secrets.OSSRH_USERNAME }}
+          OSSRH_PASSWORD: ${{ secrets.OSSRH_PASSWORD }}

pom.xml

@@ -53,6 +53,13 @@
         </dependency>
     </dependencies>
 
+    <distributionManagement>
+        <snapshotRepository>
+            <id>ossrh</id>
+            <url>https://oss.sonatype.org/content/repositories/snapshots</url>
+        </snapshotRepository>
+    </distributionManagement>
+
     <build>
         <plugins>
             <plugin>
@@ -76,6 +83,17 @@
                 <artifactId>maven-surefire-plugin</artifactId>
                 <version>2.22.1</version>
             </plugin>
+            <plugin>
+                <groupId>org.sonatype.plugins</groupId>
+                <artifactId>nexus-staging-maven-plugin</artifactId>
+                <version>1.6.7</version>
+                <extensions>true</extensions>
+                <configuration>
+                    <serverId>ossrh</serverId>
+                    <nexusUrl>https://oss.sonatype.org/</nexusUrl>
+                    <autoReleaseAfterClose>true</autoReleaseAfterClose>
+                </configuration>
+            </plugin>
         </plugins>
     </build>
 
@@ -136,4 +154,4 @@
         </license>
     </licenses>
 
-</project>
+</project>

release/m2-settings.xml

@@ -0,0 +1,9 @@
+<settings>
+    <servers>
+        <server>
+            <id>ossrh</id>
+            <username>${env.OSSRH_USERNAME}</username>
+            <password>${env.OSSRH_PASSWORD}</password>
+        </server>
+    </servers>
+</settings>