Add CI/CD Release workflow-configuration file (#593)

* Configure Automated CI Releases for Library Snapshots
- Add Release configuration file  
- Add documentation

.github/workflows/release.yml

@@ -0,0 +1,42 @@
+# This workflow will build a Java project with Gradle
+# For more information see: https://help.github.com/actions/language-and-framework-guides/building-and-testing-java-with-gradle
+
+name: Snapshot Release
+
+on:
+  push:
+    tags:
+      - v[0-9]+.[0-9]+.[0-9]+-SNAPSHOT
+      - v[0-9]+.[0-9]+.[0-9]+-[0-9a-zA-Z]+-SNAPSHOT
+      - v[0-9]+.[0-9]+.[0-9]+-[0-9a-zA-Z]+-[0-9a-zA-Z]+-SNAPSHOT 
+
+jobs:
+  release:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Cancel previous workflow runs
+        uses: styfle/[email protected]
+        with:
+          access_token: ${{ github.token }} 
+
+      - uses: actions/checkout@v2
+        with:
+         submodules: recursive
+
+      - name: Set up JDK 11
+        uses: actions/setup-java@v1
+        with:
+          java-version: 11
+
+      - name: Decode & Generate Settings.xml file
+        run: echo $SETTINGS_FILE | base64 -di > ~/.m2/settings.xml
+        env:
+          SETTINGS_FILE: ${{ secrets.SETTINGS_XML }}
+
+      - name: Generate & upload library snapshot artifact JAR (Java Archive) file
+        run: mvn clean deploy -Dmaven.test.skip=true --no-transfer-progress 
+
+      - name: Github Release
+        uses: softprops/action-gh-release@v1
+        with:
+          prerelease: ${{ contains(github.ref, '-alpha') || contains(github.ref, '-beta') }}

README.md

@@ -1,8 +1,8 @@
 # opensrp-server-core
 
-[![Build Status](https://travis-ci.org/OpenSRP/opensrp-server-core.svg?branch=master)](https://travis-ci.org/OpenSRP/opensrp-server-core)
+![Build Status](https://github.com/opensrp/opensrp-server-core/actions/workflows/ci.yml/badge.svg)
 [![Coverage Status](https://coveralls.io/repos/github/opensrp/opensrp-server-core/badge.svg?branch=v2)](https://coveralls.io/github/opensrp/opensrp-server-core?branch=v2)
-[![Codacy Badge](https://api.codacy.com/project/badge/Grade/97b0f387f0fa484caffea641f4762fbe)](https://www.codacy.com/app/OpenSRP/opensrp-server-core?utm\_source=github.com\&utm\_medium=referral\&utm\_content=OpenSRP/opensrp-server-core\&utm\_campaign=Badge\_Grade)
+[![Codacy Badge](https://app.codacy.com/project/badge/Grade/a149805a96c547acaa3bca1d25858e0b)](https://www.codacy.com/gh/opensrp/opensrp-server-core/dashboard?utm_source=github.com&utm_medium=referral&utm_content=OpenSRP/opensrp-server-core&utm_campaign=Badge_Grade)
 
 Postgres, couchdb, lucene and scheduler domain objects, repositories and services
 
@@ -33,3 +33,7 @@ When an integration test is run/executed:
 *   Test-Containers will then provide a dynamic port to connect to, from the hosts network.
 *   A single instance is created for all the tests.
 *   The docker container will be killed once all the tests have been executed.
+
+## Publishing artifacts
+
+For more on publishing this artifact see [Publishing via Tag](https://smartregister.atlassian.net/wiki/spaces/Documentation/pages/3013902337/How+to+set+up+Server+Library+artifact+CI+CD+on+Github#Publishing-via-TAG)