chore(ci): migrate CircleCI to GitHub Actions

[knqyf263]

I confirmed most of the steps worked well.
https://github.com/aquasecurity/trivy/runs/1926958833?check_suite_focus=true

[codecov]

Codecov Report

Merging #850 (df5fc59) into main (a00d719) will increase coverage by 0.17%.
The diff coverage is 71.65%.

@@            Coverage Diff             @@
##             main     #850      +/-   ##
==========================================
+ Coverage   68.50%   68.68%   +0.17%     
==========================================
  Files          57       56       -1     
  Lines        2210     2162      -48     
==========================================
- Hits         1514     1485      -29     
+ Misses        564      553      -11     
+ Partials      132      124       -8     

Impacted Files	Coverage Δ
internal/app.go	98.38% <ø> (-0.10%)	⬇️
pkg/detector/library/detect.go	0.00% <0.00%> (ø)
pkg/detector/library/npm/compare.go	100.00% <ø> (ø)
pkg/detector/ospkg/alpine/alpine.go	94.73% <ø> (ø)
pkg/detector/ospkg/debian/debian.go	81.63% <ø> (ø)
pkg/github/github.go	58.00% <0.00%> (ø)
pkg/utils/utils.go	48.21% <ø> (+8.50%)	⬆️
pkg/detector/library/driver.go	39.21% <26.92%> (-7.46%)	⬇️
pkg/detector/ospkg/amazon/amazon.go	88.37% <50.00%> (+0.13%)	⬆️
pkg/detector/library/maven/compare.go	75.00% <75.00%> (ø)
... and 13 more

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[danielpacak]

Cannot test it, but the config / changes LGTM!