Merge pull request #6993 from elopio/snapcraft-df

Update the snap metadata to keep working strictly confined

snap/snapcraft.yaml

@@ -13,10 +13,16 @@ confinement: strict
 apps:
   parity:
     command: parity
-    plugs: [network, network-bind]
+    plugs: [network, network-bind, mount-observe, x11, unity7]
 
 parts:
   parity:
     source: .
     plugin: rust
+    build-attributes: [no-system-libraries]
     build-packages: [g++, libudev-dev, libssl-dev, make, pkg-config]
+    stage-packages: [libc6, libssl1.0.0, libudev1, libstdc++6]
+  df:
+    plugin: nil
+    stage-packages: [coreutils]
+    stage: [bin/df]