feat: upgrade to bobcat (#887)

diff --git a/images/base/Earthfile b/images/base/Earthfile
index c075abc..89449e0 100644
--- a/images/base/Earthfile
+++ b/images/base/Earthfile
@@ -2,3 +2,4 @@
 
 image:
   FROM ubuntu:jammy
+  LABEL org.opencontainers.image.source=https://github.com/vexxhost/atmosphere