Request: Publish a json schema for use with semaphore YAML files

[bbugh]

schemastore.org is tracking JSON schemas. RedHat's yaml-language-server supports JSON schema parsing for YAML files pulled from schemastore.org. Many systems are using it now: GitHub's actions and workflows, graphql-code-generator's codegen.yml, CircleCI's config.yml, etc.

It's nice to have a linter in the CLI, but it would be very helpful for self-documenting files and validation if the semaphore.yml schema was published to schemastore.org, which tools (including yaml-language-server) could use to validate. There's lots of different ways to generate them.

[pieterocp]

Yeah, this is a big qol upgrade since you can get much faster feedback loops over having to push repeatedly when fiddling with config. It should only take about a week or so to get a decent working version together.

Given there is a 41:1 ROI using semaphore, you can claim even more with speedier feedback.

[pieterocp]

Until this is done, I've had to slap a docblock at the top (like below) so it doesn't think it's a appveyor file and suggests bad changes.

# yaml-language-server: $schema=https://json.schemastore.org/yamllint.json

[pieterocp]

Since the big migration to open source (see semaphoreio/semaphore#28 for this being a suggestion when editing via the workflow editor), it might be a lot easier to start to implement this?