diff --git a/.sourceignore b/.sourceignore
new file mode 100644
index 00000000..312da415
--- /dev/null
+++ b/.sourceignore
@@ -0,0 +1,21 @@
+# Exclude non-Kubernetes files from Flux sync
+.git/
+.gitlab/
+.elixir-tools/
+.expert/
+.claude/
+_build/
+deps/
+cover/
+test/
+assets/
+config/
+lib/
+priv/
+*.md
+*.exs
+*.ex
+mix.*
+.formatter.exs
+.gitignore
+Dockerfile