Added a JSON schema for telefonistka.yaml files

[tk-nguyen]

Description

Added a JSON schema for completion in editors.
Part of https://commercetools.atlassian.net/browse/ENE-104

Type of Change

• Bug Fix
• New Feature
• Breaking Change
• Refactor
• Documentation
• Other (please describe)

Notes

Completions should work in editors, provided you specify this schema. Here are some docs on how to do that:

• Associate schema with YAML plugin for VS Code
• Associate schema with YAML support for IntelliJ

If you're using vim or emacs you can RTFM :-)

[Oded-B]

We can ignore the CI failure - there's some unrelated bug that fails the docker build from forks

[Oded-B]

Suggested change

	"title": "Schema for telefonistka.yaml files",
	"title": "Schema for repo-level telefonistka.yaml files",

We have two kinds of telefonistka.yaml files, repo-level that is placed in the repo root directory and a component-level one, and that one has a different scheme.

We don't need to include the component-level scheme in this PR but we should name it in a way that support a later addition

[Oded-B]

oh, maybe also change the id field

[tk-nguyen]

I can add the component-level elements in the schema, but the completion might be confusing because it will show all available elements.

[Oded-B]

I thought we'll add a seperate scheme in a separate file
and the # yaml-language-server: $schema= URL will point to different file for each type.
But I've never used a json scheme so I'm not sure exactly how it works

[tk-nguyen]

If you're using the YAML plugin for VS Code it will automatically pull the matching schema for the file from http://www.schemastore.org/json/. We might want to make a PR to https://github.com/SchemaStore/schemastore later.

For now, we can use # yaml-language-server: $schema URL pointing to the raw schema JSON.

[tk-nguyen]

After merging this I will make a PR on https://github.com/SchemaStore/schemastore.