Add release workflows (#48)

* Add release workflows

Signed-off-by: Sayali Gaikawad <[email protected]>

* Add release documentation

Signed-off-by: Sayali Gaikawad <[email protected]>

* Add release documentation

Signed-off-by: Sayali Gaikawad <[email protected]>

* Modify version

Signed-off-by: Sayali Gaikawad <[email protected]>

Signed-off-by: Sayali Gaikawad <[email protected]>

Author: gaiksaya

.github/workflows/release-drafter.yml

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+name: Release drafter
+
+# Push events to every tag not containing "/"
+on:
+  push:
+    tags:
+      - "*"
+
+jobs:
+  draft-a-release:
+    name: Draft a release
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v3
+      - name: Set up JDK 11
+        uses: actions/setup-java@v3
+        with:
+          java-version: 11
+          distribution: 'temurin'
+          cache: gradle
+      - name: Build with Gradle
+        run: |
+          ./gradlew publishPublishMavenPublicationToLocalRepoRepository && tar -C build -cvf artifacts.tar.gz repository
+      - name: Draft a release
+        uses: softprops/action-gh-release@v1
+        with:
+          draft: true
+          generate_release_notes: true
+          files: |
+            artifacts.tar.gz

RELEASING.md

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+- [Overview](#overview)
+- [Branching](#branching)
+  - [Release Branching](#release-branching)
+  - [Feature Branches](#feature-branches)
+- [Release Labels](#release-labels)
+- [Releasing](#releasing)
+
+## Overview
+
+This document explains the release strategy for artifacts in this organization.
+
+## Branching
+
+### Release Branching
+
+Given the current major release of 1.0, projects in this organization maintain the following active branches.
+
+* **main**: The next _major_ release. This is the branch where all merges take place and code moves fast.
+* **1.x**: The next _minor_ release. Once a change is merged into `main`, decide whether to backport it to `1.x`.
+* **1.0**: The _current_ release. In between minor releases, only hotfixes (e.g. security) are backported to `1.0`.
+
+Label PRs with the next major version label (e.g. `v2.0.0.0`) and merge changes into `main`. Label PRs that you believe need to be backported as `backport 1.x` and `backport 1.0`. Backport PRs by checking out the versioned branch, cherry-pick changes and open a PR against each target backport branch.
+
+### Feature Branches
+
+Do not create branches in the upstream repo, use your fork, for the exception of long lasting feature branches that require active collaboration from multiple developers. Name feature branches `feature/<thing>`. Once the work is merged to `main`, please make sure to delete the feature branch.
+
+## Release Labels
+
+Repositories create consistent release labels, such as `v1.0.0`, `v1.1.0` and `v2.0.0`, as well as `patch` and `backport`. Use release labels to target an issue or a PR for a given release.
+
+## Releasing
+
+The release process is standard across repositories in this org and is run by a release manager volunteering from amongst [maintainers](MAINTAINERS.md).
+
+1. Create a tag, e.g. 1.0.0.0, and push it to this GitHub repository.
+1. The [release-drafter.yml](.github/workflows/release-drafter.yml) will be automatically kicked off and a draft release will be created.
+1. This draft release triggers the [jenkins release workflow](https://build.ci.opensearch.org/job/sql-jdbc-release) as a result of which the driver is released on [maven central](https://search.maven.org/search?q=org.opensearch.driver). Please note that the release workflow is triggered only if created release is in draft state.
+1. Once the above release workflow is successful, the drafted release on GitHub is published automatically.
+1. Increment "version" in [build.gradle](./build.gradle) to the next iteration, e.g. 1.0.0.1 See [example](https://github.com/opensearch-project/sql-jdbc/pull/11).

jenkins/release.jenkinsFile

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+lib = library(identifier: '[email protected]', retriever: modernSCM([
+    $class: 'GitSCMSource',
+    remote: 'https://github.com/opensearch-project/opensearch-build-libraries.git',
+]))
+
+standardReleasePipelineWithGenericTrigger(
+    tokenIdCredential: 'jenkins-sql-jdbc-generic-webhook-token',
+    causeString: 'A tag was cut on opensearch-project/sql-jdbc repository causing this workflow to run',
+    downloadReleaseAsset: true,
+    publishRelease: true) {
+        publishToMaven(
+            signingArtifactsPath: "$WORKSPACE/repository/",
+            mavenArtifactsPath: "$WORKSPACE/repository/",
+            autoPublish: true
+        )
+    }