switch to old syntax

Author: zmraul

charmcraft.yaml

@@ -11,10 +11,18 @@ type: charm
 # (ST124 syntax is needed to enable multi-base charms with Ubuntu 24.04. We use ST124 syntax across
 # all of our charms [even those that aren't multi base] for consistency and to simplify CI/CD
 # maintenance & tooling)
-platforms:
-  [email protected]:amd64:
-  # TODO: enable after charmcraft 3 migration
-  # [email protected]:amd64:
+# platforms:
+#   [email protected]:amd64:
+#   # TODO: enable after charmcraft 3 migration
+#   [email protected]:amd64:
+bases:
+  - build-on:
+      - name: "ubuntu"
+        channel: "22.04"
+    run-on:
+      - name: "ubuntu"
+        channel: "22.04"
+
 parts:
   files:
     plugin: dump