Prepend relative volumes with absolute path

[aksiksi]

Closes #17.

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 67.85714% with 9 lines in your changes are missing coverage. Please review.

Project coverage is 73.31%. Comparing base (d20f7ac) to head (34620cf).

Files	Patch %	Lines
compose.go	70.37%	7 Missing and 1 partial ⚠️
main.go	0.00%	1 Missing ⚠️

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Additional details and impacted files

@@            Coverage Diff             @@
##             main      #21      +/-   ##
==========================================
- Coverage   73.32%   73.31%   -0.02%     
==========================================
  Files           6        6              
  Lines         851      873      +22     
==========================================
+ Hits          624      640      +16     
- Misses        190      197       +7     
+ Partials       37       36       -1     

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