[gnome-shell-extensions] ci: Add some more commit message rules

[Marge Bot <marge-bot src gnome org>]

commit a4cf9f956e0da345152cfbac89e92c3732e2f800
Author: Florian Müllner <fmuellner gnome org>
Date:   Thu Dec 17 14:18:14 2020 +0100

    ci: Add some more commit message rules
    
    Now that we have the ability to easily define custom rules, add some
    more to enforce the existing commit message style.
    
    Part-of: <https://gitlab.gnome.org/GNOME/gnome-shell-extensions/-/merge_requests/149>

 .gitlab-ci/commitrules.yml | 9 +++++++++
 1 file changed, 9 insertions(+)
---
diff --git a/.gitlab-ci/commitrules.yml b/.gitlab-ci/commitrules.yml
index ef7d080..a3913a9 100644
--- a/.gitlab-ci/commitrules.yml
+++ b/.gitlab-ci/commitrules.yml
@@ -2,3 +2,12 @@ patterns:
   deny:
     - regex: '^$CI_MERGE_REQUEST_PROJECT_URL/(-/)?merge_requests/$CI_MERGE_REQUEST_IID$'
       message: Commit message must not contain a link to its own merge request
+    - regex: '^extensions/'
+      message: Commit message subject should not be prefixed with 'extensions/', use the extension name 
instead
+      where: subject
+    - regex: '^[^:]+: [a-z]'
+      message: "Commit message subject should be properly Capitalized. E.g.  'window: Marginalize 
extradicity'"
+      where: subject
+    - regex: '^\S*\.js:'
+      message: Commit message subject prefix should not include .js
+      where: subject