Add wildcard for cloudron CSP

[jolheiser]

Ughhh, https://cloudron.io/img/button.svg redirects to https://www.cloudron.io/img/button.svg, so it's still busted. 😓

As far as I understand CSP directives, this PR should work for both.

[silverwind]

I think you may need both. From spec:

Hosts such as example.com (which matches any resource on the host, regardless of scheme) or *.example.com (which matches any resource on the host’s subdomains (and any of its subdomains' subdomains, and so on))

[jolheiser]

Alright, instead I just changed the docs to point to https://www.cloudron.io and updated the CSP for the same.

[silverwind]

Could as well embed the SVG I guess if the markdown renderer allows it, but I'm fine with it either way.

[codecov-io]

Codecov Report

Merging #13892 (2b89c38) into master (991ab89) will increase coverage by 0.06%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master   #13892      +/-   ##
==========================================
+ Coverage   42.16%   42.22%   +0.06%     
==========================================
  Files         708      708              
  Lines       77191    77191              
==========================================
+ Hits        32547    32594      +47     
+ Misses      39301    39237      -64     
- Partials     5343     5360      +17     

Impacted Files	Coverage Δ
modules/indexer/stats/queue.go	64.70% <0.00%> (-11.77%)	⬇️
modules/indexer/stats/db.go	43.47% <0.00%> (-8.70%)	⬇️
modules/git/utils.go	73.77% <0.00%> (-3.28%)	⬇️
modules/process/manager.go	72.50% <0.00%> (-2.50%)	⬇️
models/repo_list.go	78.57% <0.00%> (-0.90%)	⬇️
modules/git/repo.go	45.72% <0.00%> (-0.51%)	⬇️
services/pull/pull.go	40.19% <0.00%> (-0.50%)	⬇️
models/error.go	38.66% <0.00%> (-0.49%)	⬇️
models/gpg_key.go	53.90% <0.00%> (+0.57%)	⬆️
modules/git/blame.go	67.14% <0.00%> (+1.42%)	⬆️
... and 4 more

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