Helpers resource

[orhtej2]

Add support for using additional, externally supplied helpers in application scripts:

[resources]
 [resources.helpers]
   core.version = 'current'   ## optional, this is the default value, always present at SOME version
   mongodb.version = 'v1.3'

This would magically source the following helpers (no need for source /usr/share/yunohost/helpers):

• core helpers in the version shipped with currently installed release of YunoHost
• mongodb helpers from yunohost/mongodb from tag v1.3

If this is omitted from manifest.toml a default of sourcing core@current is used.

This aims to remove copy-pasted experimental helpers for mongodb, redis, Matrix bridges etc.

We may even consider moving core helpers to separate repo to decouple YunoHost versioning from helpers versioning.

[Salamandar]

Yeah i had a POC PR that enables versionning of helpers. Would love to push that someday.

[alexAubin]

(NB: for mongodb, redis, ruby, we should really have these helpers in the core ... though i don't know how many different versions of those are in the wild x_x)