Integrate Uffizzi PR Environments

[waveywaves]

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Add support to spin up environments for every PR. This will help in debugging WikiJS alongside a Postgres instance on the PR easily without having to run the code locally.

• Add github action to build image on every PR
• Use the built image to create a PR Environment for testing Wiki.js
• Initial support for Postgres.

[waveywaves]

@NGPixel I have sent you an invitation to the uffizzi project for wikijs on your mail [email protected]. Once you accept the invite and login, you will need to add a github secret in with the key UFFIZZI_PASSWORD and value as your password you logged in to uffizzi with. This is free for WikiJS and hope you enjoy Uffizzi :)

You can check out the POC on the Pull Request in my fork here https://github.com/waveywaves/requarks-wiki/pull/3