Update for core 22

.gitignore

@@ -0,0 +1 @@
+*.snap

snap/snapcraft.yaml

@@ -1,5 +1,6 @@
 name: mythicbeastsddns
 version: 'git'
+base: core22
 summary: Automatically update dynamic dns for your Mythic Beasts hosts
 description: |
   Mythic Beasts customers can use this snap to automatically update dynamic dns
@@ -12,7 +13,9 @@ description: |
   way around this problem do not use this snap in production.
 grade: stable
 confinement: strict
-architectures: [ all ]
+architectures:
+  - build-on: [amd64]
+    build-for: [all]
 
 apps:
   mythicbeastsddns: