Set TZ=UTC for pdfsig

[oktay454]

Pull Request Description

Servers whose time zone is not UTC will receive "Invalid signingTime in certificate chain. We found Marty McFly" error.
pdfsig and pdfinfo commands TZ=UTC variable with when executed problem fixed

NextCloud 31
LibreSign 11.3.2

Related Issue

Issue Number: #5347

Pull Request Type

• Bugfix

Pull request checklist

• Did you explain or provide a way of how can we test your code ?
• Did you provide a general summary of your changes ?
• I implemented tests that cover my contribution

[vitormattos]

I made a handmade test here at the terminal and worked fine:

~/Downloads$ env TZ=Europe/Berlin  pdfsig test_signed.pdf
Digital Signature Info of: test_signed.pdf
Signature #1:
  - Signing Time: Sep 09 2025 14:39:23
~/Downloads$ env TZ=America/Sao_Paulo  pdfsig test_signed.pdf
Digital Signature Info of: test_signed.pdf
Signature #1:
  - Signing Time: Sep 09 2025 09:39:23

Will be only necessary a small change to go ahead.

[vitormattos]

Sounds good! Since this change only affects a single line, could you squash, rebase, and fix the DCO and unconventional commits issues locally?

[oktay454]

Sounds good! Since this change only affects a single line, could you squash, rebase, and fix the DCO and unconventional commits issues locally?

I don't quite understand. Should I cancel this PR and send a new one?

[vitormattos]

Should I cancel this PR and send a new one?

Isn't necessary.

Only to identify how can I help you to go ahead, did you made this change locally or did you used the GitHub interface to edit the code directly at the browser?

[oktay454]

Should I cancel this PR and send a new one?

Isn't necessary.

Only to identify how can I help you to go ahead, did you made this change locally or did you used the GitHub interface to edit the code directly at the browser?

Local. Then I sent a pull request from the Github page.

[vitormattos]

I will made here, don't worry.

[vitormattos]

I remembered that is possible to swash the commits at the PR, directly by GitHub page.

Thanks again by your contribution!

[vitormattos]

/backport to stable32

[vitormattos]

/backport to stable31

[vitormattos]

/backport to stable30