Cache bundled gems (and any other Mise artifacts)

Author: pablobm

.devcontainer/compose.yaml

@@ -8,6 +8,7 @@ services:
 
     volumes:
     - ../..:/workspaces:cached
+    - mise-cache:/home/vscode/.local/share/mise
 
     # Overrides default command so things don't shut down after the process ends.
     command: sleep infinity
@@ -38,3 +39,4 @@ services:
 
 volumes:
   postgres-data:
+  mise-cache: