[dbotconf] Update all detected Dockerfile

[MrAlias]

Currently the dbotconf command only adds an entry to update the Dockerfile at the root of a repository. There are projects, like the opentelemetry-go repository, that have many Dockerfiles that exist in subdirectories to the root.

This updates the command to discover all Dockerfiles and add an entry for them when generating and verify an entry with verifying.

Resolve #212

[codecov]

Codecov Report

Base: 58.19% // Head: 58.85% // Increases project coverage by +0.65% 🎉

Coverage data is based on head (d9ac34c) compared to base (b354012).
Patch coverage: 81.81% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #211      +/-   ##
==========================================
+ Coverage   58.19%   58.85%   +0.65%     
==========================================
  Files          44       44              
  Lines        1928     2000      +72     
==========================================
+ Hits         1122     1177      +55     
- Misses        680      692      +12     
- Partials      126      131       +5     

Impacted Files	Coverage Δ
internal/repo/repo.go	61.29% <67.64%> (+3.66%)	⬆️
dbotconf/internal/generate.go	81.03% <84.21%> (-2.30%)	⬇️
dbotconf/internal/verify.go	81.33% <90.00%> (+2.90%)	⬆️
dbotconf/internal/mods.go	57.14% <100.00%> (+7.14%)	⬆️

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