Add public to Cache-Control header

[nuuls]

Pull request checklist:

• CHANGELOG.md was updated, if applicable

Description

[codecov]

Codecov Report

Merging #418 (ed5c39b) into master (031b678) will not change coverage.
The diff coverage is 0.00%.

@@           Coverage Diff           @@
##           master     #418   +/-   ##
=======================================
  Coverage   44.49%   44.49%           
=======================================
  Files         101      101           
  Lines        3713     3713           
=======================================
  Hits         1652     1652           
  Misses       2013     2013           
  Partials       48       48           

Impacted Files	Coverage Δ
pkg/cache/middleware.go	0.00% <0.00%> (ø)

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[pajlada]

After testing, this doesn't seem necessary. Your original PR did the trick, I was just missing some magic cloudflare settings. Specifically a page rule to enable caching on the link_resolver path since by default cloudflare doesn't cache json content types