Push docker images to dockerhub & additional images for >3.5.3<4.0 releases

[mayankchetan]

Is your feature request related to a problem? Please describe.

• Availability of OpenFAST docker images on DockerHub
• Release of 3.5.x versions after 4.0 release (long term support for 3.5)

Describe the solution you'd like

• Add DockerHub credentials to repo and update GH actions to allow push to DockerHub.
• Add new workflow for releases > 3.5.3 < 4.0 based on current GH actions.

Describe alternatives you've considered

• Above solutions are simple to implement.

Additional context [edit by @andrew-platt] This issue is a placeholder so we don't forget about it when we do a 3.5.4 release post 4.0 release.

Related #2124 #2139 #2141

[andrew-platt]

For the new workflows for releases in the 3.5.x series after releasing a 4.0.0, we will need to remove the :latest so that it doesn't overwrite the latest release.

Also note that we many need to consider a main-3.5.x branch for such a release, and add some wildcard options into the new workflow to pick up on the main-*. This would allow the same workflow to be used on all future older maintainance releases.