Allow selecting executable by used ports

[mariomac]

Fixes issue #42

[codecov-commenter]

Codecov Report

Merging #53 (c4f28a6) into main (bc2f549) will decrease coverage by 1.45%.
The diff coverage is 19.73%.

@@            Coverage Diff             @@
##             main      #53      +/-   ##
==========================================
- Coverage   51.24%   49.79%   -1.45%     
==========================================
  Files          14       14              
  Lines         927      970      +43     
==========================================
+ Hits          475      483       +8     
- Misses        415      447      +32     
- Partials       37       40       +3     

Flag	Coverage Δ
unittests	49.79% <19.73%> (-1.45%)	⬇️

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

Impacted Files	Coverage Δ
pkg/ebpf/nethttp/nethttp.go	0.00% <ø> (ø)
pkg/goexec/offsets.go	0.00% <0.00%> (ø)
pkg/goexec/file.go	36.95% <5.66%> (-7.42%)	⬇️
pkg/pipe/instrumenter.go	78.84% <57.14%> (-3.77%)	⬇️
pkg/goexec/structmembers.go	68.18% <66.66%> (+1.20%)	⬆️
pkg/pipe/config.go	53.33% <100.00%> (ø)

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[grcevski]

LGTM! Really cool!