Optimize actions by checking event context

[prince-chrismc]

resolves #31

[codecov-io]

Codecov Report

Merging #39 (4c812c0) into main (8fc9b94) will not change coverage.
The diff coverage is 100.00%.

@@            Coverage Diff            @@
##              main       #39   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files            6         6           
  Lines          142       176   +34     
  Branches        16        20    +4     
=========================================
+ Hits           142       176   +34     

Impacted Files	Coverage Δ
src/label.ts	100.00% <100.00%> (ø)
src/pulls.ts	100.00% <100.00%> (ø)
src/queries.ts	100.00% <100.00%> (ø)
src/run.ts	100.00% <100.00%> (ø)
src/util.ts	100.00% <100.00%> (ø)

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