HPCC4J-505 Github Action publish snapshots (hpcc-systems#605)

- Creates action to publish snapshots

Signed-off-by: Rodrigo Pastrana <[email protected]>

.github/workflows/publish-snapshots-on-merge.yml

@@ -0,0 +1,24 @@
+name: Publish snapshot package to the Maven Central Repository
+on:
+  push:
+    branches:
+    - 'master'
+    - 'candidate-*'
+jobs:
+  publish:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v3
+      - name: Set up Maven Central Repository
+        uses: actions/setup-java@v3
+        with:
+          java-version: '11'
+          distribution: 'adopt'
+          server-id: ossrh
+          server-username: MAVEN_USERNAME
+          server-password: MAVEN_PASSWORD
+      - name: Publish package
+        run: mvn --batch-mode deploy
+        env:
+          MAVEN_USERNAME: ${{ secrets.OSSRH_USER_NAME }}
+          MAVEN_PASSWORD: ${{ secrets.OSSRH_PASS }}