Pipelines: CD pipeline

[migfontinha]

This pipeline should build and deploy the production artifact that will be used to install LZ on costumers.

Versioning, see: #38

Workflow: The positive output of the CI pipeline should notify a list of approval staff that can manually trigger the production pipeline.

[tec-goblin]

Is this addressed to customers who don't have auto-update? (for the others it's already automated, right?)

[migfontinha]

The idea is that the CI publishes and uses the test artifact and the production artifact used by the costumers for self installation is only published manually by this CD pipeline when the CI reports no failures and some additional manual tests are performed (to ensure what goes to production is stable).

We can see if GitHub supports an approval mechanism to limit the number of people that can generate the production version of LZ.