chore: add publish workflow to maven repo (#17)

Co-authored-by: xiaoweii <xiaoweii@amazom.com>

Author: zhu-xiaowei

.github/workflows/publish.yml

@@ -0,0 +1,30 @@
+name: Publish To Maven
+
+on:
+  push:
+    tags:
+      - '*'
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v3
+      - name: set up JDK 8
+        uses: actions/setup-java@v3
+        with:
+          java-version: '8'
+          distribution: 'corretto'
+          cache: gradle
+      - name: Config properties
+        run: |
+          echo "nexusUsername=${{ vars.NEXUS_USERNAME }}" >> key.properties
+          echo "nexusPassword=${{ secrets.NEXUS_PASSWORD }}" >> key.properties
+          echo "signing.keyId=${{ vars.SIGNING_KEY_ID }}" >> key.properties
+          echo "signing.password=${{ secrets.SIGNING_PASSWORD }}" >> key.properties
+          echo "signing.inMemoryKey=${{ secrets.SIGNING_IN_MEMORY_KEY }}" >> key.properties
+      - name: Grant execute permission for gradlew
+        run: chmod +x gradlew
+      - name: Assemble release
+        run: ./gradlew assembleRelease
+      - name: Publish to maven
+        run: ./gradlew publish -p clickstream