fix: ensure docker runtimes support dockerignore, empty build args and ignore other entrypoint files

[davemooreuws]

• Stops the CLI from breaking when no args are defined
• Allows .dockerignore to be used for default runtimes
• Allows a custom runtime to define a dockerignore by "[dockerfile]".dockerignore
• Adds other entrypoint files to dockerignore

[codecov]

Codecov Report

Attention: Patch coverage is 17.94872% with 32 lines in your changes are missing coverage. Please review.

Project coverage is 1.42%. Comparing base (8e4861d) to head (39a196e).

Files	Patch %	Lines
pkg/project/runtime/runtime.go	20.58%	24 Missing and 3 partials ⚠️
pkg/project/project.go	0.00%	5 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff            @@
##            main    #703      +/-   ##
========================================
+ Coverage   1.33%   1.42%   +0.08%     
========================================
  Files         73      73              
  Lines       7342    7376      +34     
========================================
+ Hits          98     105       +7     
- Misses      7239    7263      +24     
- Partials       5       8       +3     

Flag	Coverage Δ
unittests	1.42% <17.94%> (+0.08%)	⬆️

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change applied

[nitric-bot]

🎉 This PR is included in version 1.37.3 🎉

The release is available on GitHub release

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