Add web_url attribute to API response for Commits

changelogs/unreleased/rs-commit-web_url.yml

+---
+title: Add web_url attribute to API response for Commits
+merge_request: 26173
+author:
+type: added

lib/api/entities/commit.rb

@@ -9,6 +9,10 @@ module API
       expose :safe_message, as: :message
       expose :author_name, :author_email, :authored_date
       expose :committer_name, :committer_email, :committed_date
+
+      expose :web_url do |commit, _options|
+        Gitlab::UrlBuilder.build(commit)
+      end
     end
   end
 end

spec/fixtures/api/schemas/public_api/v4/commit/basic.json

@@ -12,7 +12,8 @@
     "authored_date",
     "committer_name",
     "committer_email",
-    "committed_date"
+    "committed_date",
+    "web_url"
   ],
   "properties" : {
     "id": { "type": ["string", "null"] },
@@ -32,6 +33,7 @@
     "authored_date": { "type": "date" },
     "committer_name": { "type": "string" },
     "committer_email": { "type": "string" },
-    "committed_date": { "type": "date" }
+    "committed_date": { "type": "date" },
+    "web_url": { "type": "string" }
   }
 }