feat: add ps7 charm pack and deployment

[muhammad-ali-pk]

Done

[List of work items including drive-bys]

QA

• Check out this feature branch
• Run the site using the command ./run serve
• View the site locally in your web browser at: http://0.0.0.0:8030/
• Run through the following [QA steps](https://canonical-web-and-design.github
  .io/practices/workflow/qa-steps.html)
• [List additional steps to QA the new features or prove the bug has been reso
  lved]

Issue / Card

Fixes WD-38516

Screenshots

[if relevant, include a screenshot]

[Copilot]

🟡 Changes recommended

The PS7 workflow references a local action path that doesn’t exist (and the added deploy definition is placed where GitHub will treat it as an invalid workflow), which will break deployments.

Once you've addressed the issues Copilot identified, you can request another Copilot review.

Pull request overview

Adds a new GitHub Actions-based packaging and deployment pipeline intended to build the charm and rock for this repo and deploy to ProdStack 7 (staging then production) using Juju + JAAS OAuth credentials.

Changes:

• Introduces a PS7 “Pack and Deploy” workflow that builds/caches the charm, builds/pushes a rock image to GHCR, then deploys to staging and production.
• Adds a Juju/JAAS deployment implementation intended to be reused by the workflow as a composite action.

File summaries

File	Description
.github/workflows/ps7/pack.yaml	New workflow to pack charm/rock (with caching) and deploy to PS7 staging/production.
.github/workflows/ps7/deploy.yaml	New composite-style deploy definition for Juju/JAAS-based deployments (currently placed under workflows).

Review details

• Files reviewed: 2/2 changed files
• Comments generated: 5
• Review effort level: Lite

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