Add CI to the github repo

[kuthiala]

This change brings in several CI related changes:

1. On branch push, lint helm, lint go, run unit tests, validate CNAB, publish the docker image, publish the helm chart.
2. On branch push, also run container scanning using trivy and upload trivy results to the repo.
3. On tag cut (vX.Y.Z), publish the image to docker.io, publish the chart to docker.io, and bundle CNAB and upload to the marketplace ACR.

Proposed changes

Describe the use case and detail of the change. If this PR addresses an issue on GitHub, make sure to include a link to that issue using one of the supported keywords here in this description (not in the title of the PR).

Checklist

Before creating a PR, run through this checklist and mark each as complete.

• I have read the CONTRIBUTING document
• If applicable, I have added tests that prove my fix is effective or that my feature works
• If applicable, I have checked that any relevant tests pass after adding my changes
• I have updated any relevant documentation (README.md and CHANGELOG.md)