Prevent line ending conversion in repos (#333)

Unsets the text attribute on all files to prevent their line endings
from being normalized.

See https://git-scm.com/docs/gitattributes for background.

This was previously accomplished solely by instructing users to set
core.autocrlf to false. However, that does not translate to pipelines
and setting in a pipeline requires the system level git configuration
to be modified prior to checkout. Git configs cannot be checked into
to a repo and automatically used for security reasons.

This is a simple way to check the change into the repo so it applies
for all users including pipelines to prevent line ending conversion.

This allows plugins like LineEndingCheck to produce similar results
in pipelines on Linux and Windows agents.

Signed-off-by: Michael Kubacki <[email protected]>

.sync/Files.yml

@@ -157,6 +157,28 @@ group:
       microsoft/mu_tiano_plus
       microsoft/mu_feature_mm_supv
 
+# Git Templates - .gitattributes
+  - files:
+    - source: .sync/git_templates/gitattributes_template.txt
+      dest: .gitattributes
+    repos: |
+      microsoft/mu
+      microsoft/mu_basecore
+      microsoft/mu_common_intel_min_platform
+      microsoft/mu_feature_config
+      microsoft/mu_feature_debugger
+      microsoft/mu_feature_dfci
+      microsoft/mu_feature_ipmi
+      microsoft/mu_feature_mm_supv
+      microsoft/mu_feature_uefi_variable
+      microsoft/mu_oem_sample
+      microsoft/mu_plus
+      microsoft/mu_rust_hid
+      microsoft/mu_silicon_arm_tiano
+      microsoft/mu_silicon_intel_tiano
+      microsoft/mu_tiano_platforms
+      microsoft/mu_tiano_plus
+
 # GitHub Templates - Contributing
   - files:
     - source: .sync/github_templates/contributing/CONTRIBUTING.md

.sync/git_templates/gitattributes_template.txt

@@ -0,0 +1 @@
+* -text