Update snap file

Author: qarmin

snap/snapcraft.yaml

@@ -1,5 +1,5 @@
 name: czkawka # you probably want to 'snapcraft register <name>'
-base: core18 # the base snap is the execution environment for this snap
+base: core20 # the base snap is the execution environment for this snap
 version: '3.2.0' # just for humans, typically '1.2+git' or '1.3.2'
 summary: Czkawka - fast data cleaner written in Rust # 79 char long summary
 description: |
@@ -10,26 +10,18 @@ confinement: strict # use 'strict' once you have the right plugs and slots
 
 parts:
   czkawka:
-    plugin: nil
+    plugin: rust
     source: https://github.com/qarmin/czkawka.git
     build-packages:
-      - libgtk-3-dev
       - libasound2-dev
       - curl
       - gcc
       - git
-    stage-packages:
-      - libgtk-3-dev
-    override-build: |
-      if ! command -v rustup 2>/dev/null; then
-          curl --proto '=https' --tlsv1.2 -sSf https://sh.rustup.rs | sh -s -- -y --no-modify-path --profile=minimal
-          export PATH="${HOME}/.cargo/bin:${PATH}"
-      fi
-      cargo install --locked --path czkawka_gui --root "${SNAPCRAFT_PART_INSTALL}" --force
+    rust-path: ["czkawka_gui"]
 apps:
   czkawka:
     command: bin/czkawka_gui
-    extensions: [gnome-3-28]
+    extensions: [gnome-3-38]
     plugs:
       - home
       - removable-media