Linter for PRs

[sharknoon]

Hello,

I have created a small CLI tool to help developers creating new apps for Umbrel. The tool also features a linter that detects common problems such as missing keys in yml files or malformed values.

This GitHub Action uses that linter to immediately tell, if a PR passes the check or not. Here is the list, what it checks:

umbrel-app.yml:

• Existence
• Valid YAML
• Matches schema
• Uniqueness of ports

docker-compose.yml:

• Existence
• Mocks variables (needed to pass the schema)
• Valid YAML
• Matches the official Docker Compose schema
• Container image matches <name>:<version>@<sha256>

[!NOTE] This is just a temporary solution as Umbrel is coming up with their own tooling for their new Umbrel App Framework soon

[nmfretz]

Really great work on this @sharknoon. Looking forward to integrating this to give people a nice way to check their submissions and to automate part of the review process 🎉

[sharknoon]

Thank you @nmfretz 😀