Exclude target and work from docker build context
The custom .ramekin/Dockerfile has no COPY/ADD, so target/ (1.9G)
and work/ (1.6G) never end up in the image, but docker compose build
still walks and tars the whole workspace as context on every ramekin
start. Mirroring the .gitignore entries here cuts that overhead.
Assisted-by: Claude Sonnet 5 via Claude Code
diff --git a/.dockerignore b/.dockerignore
new file mode 100644
index 0000000..c35a4ed
--- /dev/null
+++ b/.dockerignore
@@ -0,0 +1,2 @@
+/target
+/work