Add support for azure arc servers

[Kisbogyi]

This code will enable the azure module to work in Azure arc servers as well, because azure arc servers use a separate url, and method for the challenge/response protocol.
https://learn.microsoft.com/en-us/azure/azure-arc/servers/managed-identity-authentication

[github-actions]

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[Kisbogyi]

orward to reviewing your Pull r

👍

[GBBx]

Hi,
Thanks @Kisbogyi , this is a great improvement. I'd love to see it merged.
This change could fix the shellcheck:

      CHALLENGE=$(grep Www "$HTTP_HEADER" | sed 's/Www-Authenticate: Basic realm=//g' | sed 's/[^a-zA-Z0-9\/\.\-]//g')
      _H2="Authorization: Basic $(cat "$CHALLENGE")"

(Also fix a typo.)

---

Another thing: the tokens are in "/var/opt/azcmagent/tokens/" and not all users have access to it so acme.sh may need to be run by root for this scenario.

[Kisbogyi]

Hi, Thanks @Kisbogyi , this is a great improvement. I'd love to see it merged. This change could fix the shellcheck:

      CHALLENGE=$(grep Www "$HTTP_HEADER" | sed 's/Www-Authenticate: Basic realm=//g' | sed 's/[^a-zA-Z0-9\/\.\-]//g')
      _H2="Authorization: Basic $(cat "$CHALLENGE")"

(Also fix a typo.)

Another thing: the tokens are in "/var/opt/azcmagent/tokens/" and not all users have access to it so acme.sh may need to be run by root for this scenario.

Hi!
Sorry for the late response it was hectic for me, my bad.
I incorporated your change for the pr, but may need help for the tests :(
Again sorry.