add docker build and push to container registry

[joao-zanutto]

Adds GitHub Actions workflow that builds and push a docker image to ghcr.io container registry.

• workflow is triggered on a new tag being pushed in the repository
• image is tagged with two tags: :versionTag and :latest

Requires initial setup of GitHub Container Registry or Dockerhub from repository mainteners

closes #11

[vercel]

@joao-zanutto is attempting to deploy a commit to the dottle's projects Team on Vercel.

A member of the Team first needs to authorize it.

[joao-zanutto]

Initial commit was made with a personal Dockerhub repository for testing purposes, but it considers ghcr.io as target registry, however it can also be changed to support Dockerhub instead (can also support both registries in parallel).

I can assist on the initial registry setup for ghcr.io/Dockerhub, just let me know if assistance is needed

[joao-zanutto]

Values used for initial testing that will be changed before merging

[joao-zanutto]

Image built and tested with act and available on test repo in Dockerhub

Run it with docker run -p 8080:80 jpberno/test-deawdb:latest and then go to http://localhost:8080/ to check it's working.

I'll be updating the workflow to remove testing credentials, trigger and registry

[DenuxPlays]

Arm support would be great.

[DenuxPlays]

LGTM