feat(DevOps): Modify Github Action to build + publish on PR to main

[Souheil-Yazji]

Currently, only a build runs on creation of a PR and no image of the controller is published for testing purposes. No reason to be merging into main before an image of the controller is tested in dev.

Proposal

On PR (pre-merge), run both build + publish steps of the github action workflow. Modify the publish to target the dev ACR instance. Use that for testing, results of testing should be included in the pr as part of review.

A step further

Might be possible to auto-create a PR in aaw-argocd-manifests and statcan/charts to update the chart version and controller image sha.