Add option to skip _add_to_path in installer

[1oglop1]

Pull Request Check List

• A news fragment is added in news/ describing what is new.
• Test cases added for changed code.

Describe what you have changed in this PR.

I created a asdf-vm plugin for PDM https://github.com/1oglop1/asdf-pdm.
And created an issue to add it to the community plugins #asdf-community/.github/issues/33.
Also a minor change to a variable name bin which was shadowing builtin function bin.

[1oglop1]

I'm not sure how to use news/

[frostming]

I'm not sure how to use news/

add a news fragment file named {issue_id}.{type}.md under news/, describing what is changed. In this case file should be named 1145.misc.md, where misc is short for "Miscellany"

[codecov-commenter]

Codecov Report

Merging #1145 (b062fe5) into main (eab45ca) will increase coverage by 0.03%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##             main    #1145      +/-   ##
==========================================
+ Coverage   84.30%   84.33%   +0.03%     
==========================================
  Files          74       74              
  Lines        6582     6582              
  Branches     1546     1546              
==========================================
+ Hits         5549     5551       +2     
+ Misses        702      701       -1     
+ Partials      331      330       -1     

Flag	Coverage Δ
unittests	84.09% <ø> (+0.03%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
pdm/models/repositories.py	77.44% <0.00%> (+0.85%)	⬆️

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[frostming]

LGTM

[biaocy]

For security reasons, you should verify the checksum of install-pdm.py. The sha256 checksum is: 67dccb18923340e21f3d70f9c6a467d532c6a41b295d6f1ba884b27604074d38

Please update the checksum of install-pdm.py file as well, or else people who cares about security, like the one who add it in the first place, would feel a little uncertainty if they find out the latest file checksum is not the same as in README