pdtm returns `shell not supported` error

[Tarun Koyalwar]

pdtm version:

dev

Current Behavior:

• shell env variable i.e ($SHELL) is not set in gh action workflows which causes shell not supported error
• Ref: https://github.com/projectdiscovery/pdtm/actions/runs/4476348577/jobs/7866671411

Expected Behavior:

• no error