support podman even when not installed as "docker" alias

[mr-c]

Fixes https://cwl.discourse.group/t/cannot-get-cwltool-to-run-with-podman-when-step-has-dockerrequirement/711/1

[codecov]

Codecov Report

Merging #1769 (7612a6e) into main (0099f11) will increase coverage by 0.02%.
The diff coverage is 85.00%.

@@            Coverage Diff             @@
##             main    #1769      +/-   ##
==========================================
+ Coverage   82.45%   82.48%   +0.02%     
==========================================
  Files          47       47              
  Lines        8181     8195      +14     
  Branches     2232     2235       +3     
==========================================
+ Hits         6746     6760      +14     
  Misses        941      941              
  Partials      494      494              

Impacted Files	Coverage Δ
cwltool/job.py	81.21% <57.14%> (+0.14%)	⬆️
cwltool/docker.py	72.13% <75.00%> (+0.46%)	⬆️
cwltool/builder.py	90.88% <100.00%> (ø)
cwltool/command_line_tool.py	86.95% <100.00%> (+0.03%)	⬆️
cwltool/context.py	97.05% <100.00%> (ø)
cwltool/cwlrdf.py	29.06% <100.00%> (ø)
cwltool/load_tool.py	86.66% <100.00%> (ø)
cwltool/main.py	75.59% <100.00%> (+0.12%)	⬆️
cwltool/pack.py	88.00% <100.00%> (ø)
cwltool/process.py	92.47% <100.00%> (ø)
... and 4 more

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[lgtm-com]

This pull request introduces 1 alert when merging d47f15c into 0099f11 - view on LGTM.com

new alerts:

• 1 for Module-level cyclic import

---

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[cwl-bot]

This pull request has been mentioned on Common Workflow Language Discourse. There might be relevant details there:

https://cwl.discourse.group/t/cannot-get-cwltool-to-run-with-podman-when-step-has-dockerrequirement/711/7

[lgtm-com]

This pull request introduces 1 alert when merging 28fa2d2 into 0099f11 - view on LGTM.com

new alerts:

• 1 for Module-level cyclic import

---

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[lgtm-com]

This pull request introduces 1 alert when merging 7612a6e into 0099f11 - view on LGTM.com

new alerts:

• 1 for Module-level cyclic import

---

Heads-up: LGTM.com's PR analysis will be disabled on the 5th of December, and LGTM.com will be shut down ⏻ completely on the 16th of December 2022. Please enable GitHub code scanning, which uses the same CodeQL engine ⚙️ that powers LGTM.com. For more information, please check out our post on the GitHub blog.