Fix .gitattributes and normalize to LF in repository

Existing `*text eol=lf` is malformed (no space after *) so does
nothing.

CONTRIBUTING.md states 'We checkout Windows and commit *nix'.  The
correct way to achieve this is `* text=auto`. `* text eol=lf` would
force line endings to LF on checkout.

See:
https://git-scm.com/docs/gitattributes#Documentation/gitattributes.txt-Settostringvaluelf

.gitattributes

@@ -1,5 +1,11 @@
 # Auto detect text files and perform LF normalization
-*text eol=lf
+* text=auto
+
+# Explicitly set bash scripts to have unix endings
+# when checked out on windows
+*.sh text eol=lf
+distribution/debian/* text eol=lf
+macOS/Sonarr text eol=lf
 
 # Custom for Visual Studio
 *.cs     diff=csharp