Publish to AWS ECR Public Registry and EKS Marketplaces

- [x] Publish to the public ECR registry
  - Listing: https://gallery.ecr.aws/m2t7e1w5/coder-v2
  - [x] Apply for custom publisher URL
  - [x] Add image
- [x] Publish image to ECR private registry
- [ ] Publish helm chart to ECR private registry
- [ ] Update & publish marketplace listing
- [ ] Automatically push new versions to marketplace