feat(mounts): Implement mounts option for Recipe and Module

[Aex12]

This PR implements the mounts option as proposed in blue-build/schema#16

[gmpinder]

Looking good so far can you add some of this new functionality to the recipe in ./integration-test/test-repo/? That one is one that gets built in the integration tests. The one you were updating, which was needed, is for testing the schema.

[gmpinder]

I also left a comment in discord about updating the constant for the schema base URL. Doing that will pull the new schema changes before they get fully merged in.

[Aex12]

Hi @gmpinder,

I just updated the integration tests and the schema base url constant

[Aex12]

Hi @gmpinder I just updated all the other recipes in the integration tests to include the cache mount option so that the test defined in common.yml wont fail for those tests. This should fix the integration tests not passing.

[gmpinder]

I'm seeing the error message unrecognized value "private" for field 'sharing'