fix: change default CSP value

[nthsky]

Why submit this pull request?

• Bugfix

What changes will this PR take into?

It changes dashboard default CSP. Add unsafe-inline to script-src and add img-src

Current default csp policy is

"default-src 'self'; script-src 'self' 'unsafe-eval'; style-src 'self' 'unsafe-inline'"

Problems:

1. script-src without "unsafe-inline" cause error like this:

Refused to execute inline script because it violates the following Content Security Policy directive: "script-src 'self' 'unsafe-eval'". Either the 'unsafe-inline' keyword, a hash ('sha256-9B0adsvsNyel0bNudomHjhrSk758zuql+j59Udq5xCo='), or a nonce ('nonce-...') is required to enable inline execution.

2. no img-src cause that the plugin page without icon using base64 img cannot show correctly.

Changes:

After, default CSP changes to

"default-src 'self'; script-src 'self' 'unsafe-eval' 'unsafe-inline'; style-src 'self' 'unsafe-inline'; img-src 'self' data:"

[codecov-commenter]

Codecov Report

Merging #2601 (c61f023) into master (b5672b6) will decrease coverage by 2.34%.
The diff coverage is 50.00%.

@@            Coverage Diff             @@
##           master    #2601      +/-   ##
==========================================
- Coverage   76.44%   74.10%   -2.35%     
==========================================
  Files         139      201      +62     
  Lines        3749     7824    +4075     
  Branches      873      873              
==========================================
+ Hits         2866     5798    +2932     
- Misses        883     1726     +843     
- Partials        0      300     +300     

Flag	Coverage Δ
backend-e2e-test-ginkgo	64.95% <50.00%> (?)
backend-unit-test	50.07% <50.00%> (?)
frontend-e2e-test	76.44% <ø> (ø)

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

Impacted Files	Coverage Δ
api/internal/conf/conf.go	66.00% <50.00%> (ø)
api/main.go	100.00% <0.00%> (ø)
api/internal/handler/schema/plugin.go	100.00% <0.00%> (ø)
api/internal/handler/schema/schema.go	100.00% <0.00%> (ø)
api/internal/handler/upstream/upstream.go	86.58% <0.00%> (ø)
api/internal/core/store/store_mock.go	0.00% <0.00%> (ø)
api/internal/handler/consumer/consumer.go	92.06% <0.00%> (ø)
api/internal/log/log.go	60.00% <0.00%> (ø)
api/internal/handler/label/label.go	86.20% <0.00%> (ø)
api/internal/filter/invalid_request.go	100.00% <0.00%> (ø)
... and 53 more

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[bzp2010]

Thanks for your contribution.