GitHub Actions CI

[martincostello]

• Switch to GitHub Actions for CI.
• Support PowerShell Core for building on non-Windows platforms.
• Add support for deterministic builds in the future.
• Skip sample test on non-Windows platforms.
• Update README copyright year.

[codecov]

Codecov Report

Merging #224 into master will increase coverage by 0.46%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #224      +/-   ##
==========================================
+ Coverage   93.54%   94.01%   +0.46%     
==========================================
  Files          22       22              
  Lines        1703     1703              
==========================================
+ Hits         1593     1601       +8     
+ Misses        110      102       -8     

Flag	Coverage Δ
#linux	57.72% <ø> (-1.92%)	⬇️
#macos	57.72% <ø> (?)
#osx	?
#windows	93.48% <ø> (+0.41%)	⬆️

Impacted Files	Coverage Δ
src/SqlLocalDb/TemporarySqlLocalDbInstance.cs	96.42% <0.00%> (-2.39%)	⬇️
src/SqlLocalDb/Interop/LocalDbInstanceApi.cs	89.80% <0.00%> (-0.79%)	⬇️
src/SqlLocalDb/ILoggerExtensions.cs	95.45% <0.00%> (+0.45%)	⬆️
src/SqlLocalDb/SR.Designer.cs	89.89% <0.00%> (+1.01%)	⬆️
src/SqlLocalDb/SqlLocalDbApi.cs	91.06% <0.00%> (+1.96%)	⬆️

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