Publish snapshots to maven via GHA

[gaiksaya]

Coming from opensearch-build#3185

What is happening?

We are de-coupling the task of publishing the maven snapshots from centralized build workflow to individual repositories. What this means is each repo can now publish maven snapshots using GitHub Actions.
This change unblocks the dependent components from waiting for a successful build before they can consume the snapshots. This also ensures that all snapshots are independent and up to date.

What do you need to do?

1. Determine what artifacts you publish to maven. Most plugins publish only zips. Example.
2. Add below repository under publishing in build.gradle:

    repositories {
        maven {
            name = "Snapshots"
            url = "https://aws.oss.sonatype.org/content/repositories/snapshots"
            credentials {
                username "$System.env.SONATYPE_USERNAME"
                password "$System.env.SONATYPE_PASSWORD"
            }
        }
    }

Example

3. Determine what gradle task will publish the content to snapshots repo. Example: ./gradlew publishPluginZipPublicationToSnapshotsRepository.
4. Create a pull request to set up a GitHub action that will fetch the credentials and publish the snpahots to https://aws.oss.sonatype.org/ See sample workflow.
5. Add @gaiksaya as a reviewer, who will also take care of creating the IAM role that is required to fetch the credentials and add it to the GitHub Secrets.

Please feel free to reach out to @opensearch-project/engineering-effectiveness.

[gaiksaya]

Hi @opensearch-project/neural-search ,

This was tagged for 2.6.0 and did not get in. Can you take a look and take action accordingly?
This is not a product change but an infra change and we will be soon decommissioning the central workflow. See META issue for details.

Thanks!

[bbarani]

@VijayanB @jmazanec15 @vamshin Can you please prioritize this effort? We will be disabling the snapshot upload process through distribution build process by March 15 2023.