Added license file and copyright notice.

[dblock]

We're using this action for DCO checks and noticed the license file is missing. The package.json specifies ICS license so I just added a license file from https://choosealicense.com/licenses/isc/.

Signed-off-by: dblock dblock@amazon.com

[lukas-vlcek]

@dblock I run into this issue as well.

For my code I switched to https://github.com/tisonkun/actions-dco which has explicit license file and also does not require additional GH action to be executed first to pull PR commits. It simplifies the flow configuration a bit IMO (see opensearch-project/opensearch-prometheus-exporter#210 for example).

Also the new dco action implementation seem to provide more elaborated description of how to sign-off commits (which is very helpful).

[peternied]

Thanks @lukas-vlcek. We've ended up phasing out our usage of this GitHub Action in favor of using an App https://probot.github.io/apps/dco/. Compliance wise its much easier for use to ensure apply to our whole organization.

[lukas-vlcek]

@peternied Still I can see GH action being used all over the place here: search opensearch-project org for "tim-actions/dco"

[dblock]

@peternied Still I can see GH action being used all over the place here: search opensearch-project org for "tim-actions/dco"

Looks like they are just dups now with the org-wide tool, and should be bulk deleted. @peternied want to followup?

[lukas-vlcek]

@peternied Perhaps https://github.com/opensearch-project/opensearch-plugin-template-java should be treated with an exception because we can not assume the GitHub App is installed in the target repository/org.

@Tim-Zhang I apology for hijacking this PR. 🙏

[peternied]

I've created a [slack thread] to continue the discussion.

@.Tim-Zhang thanks for letting us borrow this PRs' comments section for this aside.