Merge ~jocave/plainbox-provider-snappy/+git/parts-meta-info:apply-dn9-change into ~checkbox-dev/plainbox-provider-snappy/+git/parts-meta-info:master

[Jonathan Cave]

Apply the changes indicated by snapcraft deprecation notice:
https://docs.snapcraft.io/deprecation-notices/dn9

[Paul Larson (pwlars)]

Yay, less build spam! +1

[Paul Larson (pwlars)]

review: Approve

diff --git a/snapcraft.yaml b/snapcraft.yaml
index 61169f9..b5651ec 100644
--- a/snapcraft.yaml
+++ b/snapcraft.yaml
@@ -9,7 +9,8 @@ version: stable
 parts:
     parts-meta-info:
         plugin: nil
-        install: |
+        override-build: |
+            snapcraftctl build
             for p in `ls -d ../../*`; do
                 (cd $p/src
                     if [ -d $p/src/.git ]; then