feat(GAdocker): Publish docker image with Github Actions

[tttfrfr2]

What did you implement:

Publish docker image "vuls/vuls" with Github Actions when Vuls is added tag or pushed at master branch.

Type of change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• This change requires a documentation update

How Has This Been Tested?

Tested on my repository is forked.

1. Push to my repository (branch:GAdocker)
2. Merge GAdocker branch
3. Run Github Actions (can check how run Github Actions "Publish-docker-image")
4. Update docker image (docker hub) (can check vuls:vuls was updated by tttfrfr2)

Checklist:

• Enable "Allow edits from maintainers" for this PR

Tips

Note that this Github Action "Publish-docker-image" is run correctly only if Secrets, "DOCKERHUB_USERNAME" and "DOCKERHUB_TOKEN", were setting.

Is this ready for review?: Yes