Add publish in spi build.gradle

[bowenlan-amzn]

Description

Publish the spi to maven

Can be consumed as compileOnly "org.opensearch:opensearch-index-management-spi:${opensearch_version}"

Example commit of extend ISM opensearch-project/cross-cluster-replication@3853901

Test

Test locally by running ./gradlew publishShadowPublicationToStagingRepository

Reference
opensearch-project/alerting#1562
opensearch-project/alerting#1604
https://github.com/opensearch-project/opensearch-plugins/blob/main/BUILDING.md#include-checksums-in-maven-publications

Check List

• New functionality includes testing.
• New functionality has been documented.
• API changes companion pull request created.
• Commits are signed per the DCO using --signoff.
• Public documentation issue/PR created.

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.
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[prudhvigodithi]

Thanks @bowenlan-amzn can you please also confirm if there is no change in publishing of the zip file ?

<groupId>org.opensearch.plugin</groupId>
<artifactId>opensearch-index-management</artifactId>
<version>2.16.0.0-SNAPSHOT</version>
<packaging>zip</packaging>

https://aws.oss.sonatype.org/content/repositories/snapshots/org/opensearch/plugin/opensearch-index-management/

[bowenlan-amzn]

Thanks @bowenlan-amzn can you please also confirm if there is no change in publishing of the zip file ?

<groupId>org.opensearch.plugin</groupId>
<artifactId>opensearch-index-management</artifactId>
<version>2.16.0.0-SNAPSHOT</version>
<packaging>zip</packaging>

aws.oss.sonatype.org/content/repositories/snapshots/org/opensearch/plugin/opensearch-index-management

I run publishPluginZipPublicationToZipStagingRepository, and here's the result, it looks good to me

@prudhvigodithi and a quick question, do we need to backport this to any branch other than 2.x?

[prudhvigodithi]

Thanks @bowenlan-amzn, ya as long as there no change in publishing of the zip file we should be good, also just 2.x as the gradle custom plugin used opensearch.pluginzip is only available starting 2.x. https://opensearch.org/blog/opensearch-plugin-zips-now-in-maven-repo/
Thank you