CI: PR1 - Create reusable workflow (BLOCKER PR)

[vbhavh]

Summary

Created a reusable workflow
Key points:

• No permissions: block
• Uses org secret
• This PR must be merged FIRST.

Related issue(s)

kagenti/kagenti#870

[rubambiza]

Clarifying comment about the access tokens and action version pinning.

[vbhavh]

@rubambiza
This workflow requires a fine-grained PAT with Projects: Read & Write permission because GITHUB_TOKEN does not support GitHub Projects.

Could an org admin please:

Create a fine-grained PAT scoped to the kagenti org
Store it as an org-level secret named ADD_TO_PROJECT_PAT

Once that is set up, the workflow will work as expected.

[rubambiza]

@vbhavh Good progress so far, thanks! Some feedback/status below:

• Your most recent commit is missing a Sign-Off for DCO (see here for remediation instructions)
• Thanks for the exact instructions on the PAT and org-level secret
• While I work with admins to get the PAT and secret setup, can you kindly move forward with replicating the workflow invocation to all other repos. I'll update on this issue when the secret is ready.