diff --git a/.gitattributes b/.gitattributes
new file mode 100644
index 0000000..a1abf55
--- /dev/null
+++ b/.gitattributes
@@ -0,0 +1,6 @@
+# Force LF for files consumed by Linux toolchains (docker build / bash).
+# Windows dev checkouts otherwise get CRLF via core.autocrlf, breaking
+# `#!/bin/bash` and Dockerfile heredocs in container.
+*.sh         text eol=lf
+Dockerfile   text eol=lf
+*.Dockerfile text eol=lf