Support for env vars in `command:`
It is currently not possible to use environment strings in the “command:” part of an app in snap.yaml. People are creating wrapper scripts for that right now. To make this easier I think we should allow it so that you can write e.g.:
name: some-snap version: 1.0 apps: some-app: command: bin/some-app --data-dir $SNAP_DATA
The following PR implements that: https://github.com/snapcore/snapd/pull/3995
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