Develop github actions to deploy api to different environments

[sujen1412]

No description provided.

[frankinspace]

API is now being deployed to DIT environment via GH Action.

API settings are consolidated into a single environment secret called MAAP_API_SETTINGS_OVERRIDE. Follow on ticket will address this #124

Every push to the develop branch will trigger an automated deployment to DIT. Recent deployments can be monitored at https://github.com/MAAP-Project/maap-api-nasa/deployments

Every push to the develop branch will tag a new 'alpha' release. Alpha number is incremented by 1 on every push. The alpha version will be used as the docker tag for the image in addition to an environment-specific tag (DIT in this case). Docker images and tags can be viewed at https://github.com/MAAP-Project/maap-api-nasa/pkgs/container/maap-api-nasa. Docker images are also pushed to GitLab, discussion to remove this is tracked in #125

Deployments are achieved by using an organization level self-hosted runner which is running in the deployment environment. docker-compose is used to restart the service. It would be preferable to deploy via terraform without a need for self-hosted runner. This is tracked in #126