refactor: ActiveStorage

[toadfanszz]

• ref: Remove currentPod in Current module #94
• fix: Download Link block should real download, but not open in tab #300

1. Introduce rack-cors in development environment to fix CORS error.
2. Remove current_pod dependency in create_direct_upload
3. add downloadUrl field to download directly when click download.

[codecov]

Codecov Report

Merging #441 (8a435d6) into main (700eaab) will decrease coverage by 0.00%.
The diff coverage is 73.68%.

@@            Coverage Diff             @@
##             main     #441      +/-   ##
==========================================
- Coverage   69.70%   69.70%   -0.01%     
==========================================
  Files        1060     1060              
  Lines       18015    18020       +5     
  Branches     2490     2492       +2     
==========================================
+ Hits        12558    12561       +3     
- Misses       5143     5146       +3     
+ Partials      314      313       -1     

Flag	Coverage Δ
backend-unit	87.56% <100.00%> (+<0.01%)	⬆️
frontend-unit	65.35% <61.53%> (-0.01%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
...tEditor/useEditorOptions/useEmbed/useGetFileUrl.ts	0.00% <0.00%> (ø)
...Views/EmbedView/embedViews/ImageView/ImageView.tsx	81.48% <ø> (ø)
.../legacy-editor/src/extensions/blocks/embed/meta.ts	100.00% <ø> (ø)
...lith/app/graphql/mutations/create_direct_upload.rb	84.37% <100.00%> (+1.04%)	⬆️
.../src/components/blockViews/EmbedView/EmbedView.tsx	75.00% <100.00%> (+1.56%)	⬆️
...ckViews/EmbedView/embedViews/CardView/CardView.tsx	93.54% <100.00%> (ø)
...ws/EmbedView/embedViews/ImageView/useImageState.ts	92.30% <100.00%> (ø)
...s/EmbedView/embedViews/PreviewView/PreviewView.tsx	100.00% <100.00%> (ø)

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[github-actions]

This pull request has been built and is available for preview at pr441.mashcard.dev.
Default username/password is test1@example.com & test1234.

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[Darmody]

LGTM