Add copy button to blob header and use icon for Raw button

app/views/projects/blob/_actions.html.haml

-- if @environment
-  .btn-group<
+
+.btn-group{ role: "group" }<
+  = clipboard_button(clipboard_target: ".blob-content[data-blob-id='#{@blob.id}']", class: "btn btn-sm")
+  = link_to icon('download'), namespace_project_raw_path(@project.namespace, @project, @id),
+      class: 'btn btn-sm has-tooltip', target: '_blank', title: 'Download raw', data: { container: 'body' }
+  - if @environment
     = view_on_environment_button(@commit.sha, @path, @environment)
 
 .btn-group{ role: "group" }<
-  = link_to 'Raw', namespace_project_raw_path(@project.namespace, @project, @id),
-      class: 'btn btn-sm', target: '_blank'
   -# only show normal/blame view links for text files
   - if blob_text_viewable?(@blob)
     - if current_page? namespace_project_blame_path(@project.namespace, @project, @id)

changelogs/unreleased/add-blob-copy-button.yml

+---
+title: Add copy button to blob header and use icon for Raw button
+merge_request:
+author: