Ecs-deploy

**Full Changelog**: https://github.com/silinternational/ecs-deploy/compare/3.10.20...3.10.21

What's Changed
* Add support for container image with digest by u-kai in https://github.com/silinternational/ecs-deploy/pull/300

New Contributors
* u-kai made their first contribution in https://github.com/silinternational/ecs-deploy/pull/300

**Full Changelog**: https://github.com/silinternational/ecs-deploy/compare/3.10.19...3.10.20

Pushing the Docker images to ghcr.io (Git Container Registry)

Fixed
- Keep `proxyConfiguration`, if present (Fixes 236)
- Correct typo in Action name (ECS-Deploy)

Changed
- Convert to Github actions
- Update README to use more generic names for clusters, services, and images

Removed
- README and ecs-deploy no longer list silintl/mariadb as an example

Fixed
- Fixed tag name regular expression to allow underscores.