Merge ~hloeung/mailman3-core-charm:fixes into mailman3-core-charm:master

[Haw Loeung]

Pin charm tools to 2.x

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

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

[🤖 Canonical IS Review Bot (canonical-is-reviewbot)]

Proxy approval for barryprice

review: Approve

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

Change successfully merged at revision 3818b8c84d0252939ea6cfc68a80312abad6f2b4

diff --git a/charmcraft.yaml b/charmcraft.yaml
index 1da5d37..796140c 100644
--- a/charmcraft.yaml
+++ b/charmcraft.yaml
@@ -1,21 +1,14 @@
 type: "charm"
 bases:
-  - build-on:
-    - name: "ubuntu"
-      channel: "18.04"
-    - name: "ubuntu"
-      channel: "20.04"
-    - name: "ubuntu"
-      channel: "21.10"
-    run-on:
-    - name: "ubuntu"
-      channel: "18.04"
-    - name: "ubuntu"
-      channel: "20.04"
-    - name: "ubuntu"
-      channel: "21.10"
+  - name: "ubuntu"
+    channel: "18.04"
+  - name: "ubuntu"
+    channel: "20.04"
+  - name: "ubuntu"
+    channel: "22.04"
 parts:
   charm:
     source: .
     plugin: reactive
-    build-snaps: [charm]
+    build-snaps:
+      - charm/2.x/stable