Merge ~stub/juju-lint:snap into juju-lint:master

[Stuart Bishop]

Avoid dependencies in snap's version-script

We cannot use setup.py to emit the debian/changelog version, as
setuptools is not available as a build dependency at that level.
Instead, use sed to extract the most recent debian/changelog
version.

[Stuart Bishop (stub)]

(it was working locally and under cleanbuild, but not in the LP build)

[🤖 Canonical IS Merge Bot (canonical-is-mergebot)]

This merge proposal is being monitored by mergebot. Change the status to Approved to merge.

[🤖 Canonical IS Merge Bot (canonical-is-mergebot)]

Change successfully merged at revision 9ed2941d8442fa77df26218a5f635398495f89a9

diff --git a/snap/snapcraft.yaml b/snap/snapcraft.yaml
index 1ea2104..ddf7ea5 100644
--- a/snap/snapcraft.yaml
+++ b/snap/snapcraft.yaml
@@ -5,7 +5,7 @@ description: Linter for Juju models to compare deployments with configurable pol
 grade: stable
 confinement: classic
 version-script: |
-  echo `python3 setup.py -V`-`git describe --dirty --always --tags | sed -r 's/v(.*)/\1/g'`
+  echo `head -1 debian/changelog | sed -rn 's/.*\((.*)\).*/\1/p'`-`git describe --dirty --always --tags | sed -r 's/v(.*)/\1/g'`
 apps:
   juju-lint:
     command: usr/bin/python3 $SNAP/bin/juju-lint