rp flash deploy fails when requirements.txt has an inline comment #721

Describe the bug

A requirements.txt line with an inline comment, such as requests==2.32.3 # http client, makes rp flash deploy fail during dependency vendoring. The error ends with a hint about packages without Linux wheels, which does not apply to requests. pip itself accepts the same file with pip install -r requirements.txt.

To Reproduce

1. In a Flash project, create requirements.txt containing:

   requests==2.32.3  # http client
   

2. Run rp flash deploy --build-only:

   Error: dependency vendoring failed:
   ERROR: Invalid requirement: 'requests==2.32.3  # http client': Expected comma (within version specifier), semicolon (after version specifier) or end
       requests==2.32.3  # http client
               ~~~~~~~~~~^
   
   packages without linux wheels cannot be vendored; exclude them (they must then come from the image)
   

In addition, a -r extra.txt line is skipped without a warning. With requirements.txt containing requests==2.32.3 and -r extra.txt, and extra.txt containing numpy==2.1.3, the build succeeds, but numpy is not in the built artifact.

Expected behavior

1. Inline comments are ignored, as pip ignores them, and the deploy vendors requests==2.32.3.
2. A -r line is either followed, or the deploy stops with an error that names the line it does not support.

Environment

• OS: Arch Linux (WSL2)
• Python: 3.12
• Version: runpod 2.1.0