goanywhere command -- create a Go workspace on the fly

[hugelgupf]

Allow compilation of Go commands even when not in a Go module.

Examples:

goanywhere ./u-root/cmds/core/ip -- go build -o $(pwd)

goanywhere ./u-root/cmds/core/init ./cpu/cmds/cpud -- mkuimage

goanywhere ./u-root/cmds/core/init ./cpu/cmds/cpud -- go build -o $(pwd)

goanywhere ./u-root/cmds/core/\* ./cpu/cmds/cpud -./u-root/cmds/core/ip -- makebb -o $(pwd)

GBB_PATHS=$HOME/u-root:$HOME/cpu goanywhere cmds/core/\* cmds/cpud -cmds/core/ip -- makebb -o $(pwd)

[codecov]

Codecov Report

Attention: Patch coverage is 85.98131% with 15 lines in your changes are missing coverage. Please review.

Project coverage is 62.44%. Comparing base (af2844f) to head (265ea87).

Files	Patch %	Lines
src/cmd/goanywhere/main.go	82.05%	14 Missing ⚠️
src/pkg/bb/findpkg/bb.go	96.55%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #114      +/-   ##
==========================================
+ Coverage   59.18%   62.44%   +3.26%     
==========================================
  Files          15       16       +1     
  Lines        1078     1185     +107     
==========================================
+ Hits          638      740     +102     
- Misses        440      445       +5     

Flag	Coverage Δ
1.20	84.22% <85.98%> (+1.67%)	⬆️
1.21.x	84.22% <85.98%> (+1.67%)	⬆️
1.22.x	62.44% <85.98%> (+3.26%)	⬆️

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