feat(docker-compose): Expose YAML file as property

[icj217]

The docker compose components don't fully implement the compose spec, so there's often a need to directly extend/mutate the YAML file. Making the file accessible in the same way that it's done in a lot of other components.

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By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.

[codecov-commenter]

Codecov Report

Merging #2866 (1a79281) into main (e93fadd) will increase coverage by 0.00%.
Report is 2 commits behind head on main.
The diff coverage is 95.73%.

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@@           Coverage Diff            @@
##             main    #2866    +/-   ##
========================================
  Coverage   96.41%   96.41%            
========================================
  Files         181      181            
  Lines       33697    33842   +145     
  Branches     3103     3127    +24     
========================================
+ Hits        32488    32628   +140     
- Misses       1209     1214     +5     

Files Changed	Coverage Δ
src/github/pull-request-lint.ts	96.88% <95.07%> (-3.12%)	⬇️
src/docker-compose/docker-compose.ts	100.00% <100.00%> (ø)
src/github/pr-template.ts	100.00% <100.00%> (ø)
src/javascript/eslint.ts	98.01% <100.00%> (ø)

... and 1 file with indirect coverage changes

[mrgrain]

@icj217 Can't merge this until the PR description includes the following license footer.

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By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.

[icj217]

@icj217 Can't merge this until the PR description includes the following license footer.

@mrgrain Fixed! Sorry about that. Also added a test to inspect the new property.

[mrgrain]

@mrgrain Fixed! Sorry about that. Also added a test to inspect the new property.

No worries! This prompted me to finally add an automated check for it 😂
Thanks for the test as well!