Bug 1663372 - Ignore toolchains.json file with git. r=glandium

Differential Revision: https://phabricator.services.mozilla.com/D89337

.gitignore

@@ -7,6 +7,8 @@
 TAGS
 tags
 compile_commands.json
+toolchains.json
+
 # Ignore ID generated by idutils and un-ignore id directory (for Indonesian locale)
 ID
 !id/
@@ -166,4 +168,3 @@ lextab.py
 .vscode/
 !.vscode/extensions.json
 !.vscode/tasks.json
-