Revert "Delete app-4-fix-missing-git-repository.patch"

This reverts commit fbf5ec199d.

sources/patches/app-4-fix-missing-git-repository.patch

@@ -0,0 +1,22 @@
+diff --git a/lib/discourse.rb b/lib/discourse.rb
+index 2b53a91eb3..eec55647d5 100644
+--- a/lib/discourse.rb
++++ b/lib/discourse.rb
+@@ -439,7 +439,7 @@ module Discourse
+     $full_version ||=
+       begin
+         git_cmd = 'git describe --dirty --match "v[0-9]*"'
+-        self.try_git(git_cmd, 'unknown')
++        self.try_git(git_cmd, Discourse::VERSION::STRING)
+       end
+   end
+
+@@ -448,7 +448,7 @@ module Discourse
+     $last_commit_date ||=
+       begin
+         git_cmd = 'git log -1 --format="%ct"'
+-        seconds = self.try_git(git_cmd, nil)
++        seconds = '1563199245' # Note(decentral1se): Output from actual command in the v2.3.2 branch
+         seconds.nil? ? nil : DateTime.strptime(seconds, '%s')
+       end
+   end