feat: Add GitHub Action support

[klauern]

• 👷 add GitHub Actions
• 💚 add go generate step
• 💚 fix branches

[codecov[bot]]

Codecov Report

Merging #181 (1223a86) into master (c4ad289) will not change coverage. The diff coverage is 0.00%.

@@           Coverage Diff           @@
##           master     #181   +/-   ##
=======================================
  Coverage   42.92%   42.92%           
=======================================
  Files          10       10           
  Lines         664      664           
=======================================
  Hits          285      285           
  Misses        344      344           
  Partials       35       35           

Impacted Files	Coverage Δ
pkg/aws/log/log.go	0.00% <0.00%> (ø)

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[danmx]

covered by https://github.com/danmx/sigil/pull/186 and https://github.com/danmx/sigil/pull/191