diff --git a/.gitattributes b/.gitattributes
new file mode 100644
index 0000000..50300e0
--- /dev/null
+++ b/.gitattributes
@@ -0,0 +1,5 @@
+# Shell scripts must stay LF or the shebang/exec breaks on Linux/macOS,
+# including when a Windows checkout is COPY'd into a Docker build.
+*.sh text eol=lf
+Dockerfile text eol=lf
+*.ps1 text eol=crlf