chore: fix git_sha in instance health (#8893)

- Fix git-hash in super admin instance health page for Heroku installations
- Fix git boundary not set error for docker/heroku deployments which remove .git directory

app/controllers/super_admin/instance_statuses_controller.rb

@@ -28,8 +28,7 @@ class SuperAdmin::InstanceStatusesController < SuperAdmin::ApplicationController
   end
 
   def sha
-    sha = `git rev-parse HEAD`
-    @metrics['Git SHA'] = sha.presence || 'n/a'
+    @metrics['Git SHA'] = GIT_HASH
   end
 
   def postgres_status

config/initializers/git_sha.rb

@@ -1,6 +1,6 @@
 # Define a method to fetch the git commit hash
 def fetch_git_sha
-  sha = `git rev-parse HEAD`
+  sha = `git rev-parse HEAD` if File.directory?('.git')
   if sha.present?
     sha.strip
   elsif File.exist?('.git_sha')

spec/controllers/super_admin/instance_statuses_controller_spec.rb

@@ -17,8 +17,7 @@ RSpec.describe 'Super Admin Instance status', type: :request do
         get '/super_admin/instance_status'
         expect(response).to have_http_status(:success)
         expect(response.body).to include('Chatwoot version')
-        sha = `git rev-parse HEAD`
-        expect(response.body).to include(sha)
+        expect(response.body).to include(GIT_HASH)
       end
     end
   end