Add workflow to publish snapshots (opensearch-project#312)

Signed-off-by: Sayali Gaikawad <gaiksaya@amazon.com>

.github/workflows/publish-snapshots.yml

@@ -0,0 +1,29 @@
+name: Publish snapshots to maven
+
+on:
+  schedule:
+    - cron: 0 */12 * * *
+
+jobs:
+  build-and-publish-snapshots:
+    runs-on: ubuntu-latest
+    permissions:
+      id-token: write
+      contents: write
+    steps:
+      - uses: actions/checkout@v3
+      - name: Set up JDK 11
+        uses: actions/setup-java@v3
+        with:
+          java-version: 11
+          distribution: adopt
+      - name: Configure AWS credentials
+        uses: aws-actions/configure-aws-credentials@v1
+        with:
+          role-to-assume: ${{ secrets.PUBLISH_SNAPSHOTS_ROLE }}
+          aws-region: us-east-1
+      - name: publish snapshots to maven
+        run: |
+          echo "SONATYPE_USERNAME=$(aws secretsmanager get-secret-value --secret-id maven-snapshots-username --query SecretString --output text)" >> $GITHUB_ENV
+          echo "SONATYPE_PASSWORD=$(aws secretsmanager get-secret-value --secret-id maven-snapshots-password --query SecretString --output text)" >> $GITHUB_ENV
+          ./gradlew publishMavenJavaPublicationToSnapshotsRepository