Set CONAN_REMOTE_URL also for forks

[Bronek]

High Level Overview of Change

This should fix workflow errors for PRs from forks

Context of Change

As stated in https://github.com/XRPLF/rippled/blob/develop/BUILD.md , rippled requires certain workarounds to be applied in external dependencies e.g. to ensure static linking of libstdc++ . This used to be applied by means of conan export --version . . . , but recently we have switched workflows to use a Conan remote https://conan.ripplex.io where we apply the relevant patches. We decided to put this remote in configuration variable but forgot that configuration variables are not available to PRs built from forks. As a result, PRs such as #5637 will use dependencies without workarounds, causing CI errors.

This PR replaces configuration variable with hardcoded https://conan.ripplex.io , making it possible for PRs from forks to use the Conan remote with workarounds.

Type of Change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Refactor (non-breaking change that only restructures code)
• Performance (increase or change in throughput and/or latency)
• Tests (you added tests for code that already exists, or your new feature included in this PR)
• Documentation update
• Chore (no impact to binary, e.g. .gitignore, formatting, dropping support for older tooling)
• Release

[bthomee]

You can just hardcode both the URL (https://conan.ripplex.io) and the name (xrplf).

I had added it like this because env vars cannot be used as a "with" input to call reusable workflows, which I'm using in my CI refactor PR that's still under development. However I suspected this would be an issue in forks, which is now confirmed.

Therefore, hardcoding seems to be the only option, and I'll figure out a workaround to pass them to reusable workflows later.

[Bronek]

hardcoding seems to be the only option, and I'll figure out a workaround to pass them to reusable workflows later

Perhaps hardcode an env. variable, like I did ?

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 78.8%. Comparing base (bdfc376) to head (3740283).
⚠️ Report is 1 commits behind head on develop.

Additional details and impacted files

@@           Coverage Diff           @@
##           develop   #5662   +/-   ##
=======================================
  Coverage     78.8%   78.8%           
=======================================
  Files          814     814           
  Lines        71294   71294           
  Branches      8368    8369    +1     
=======================================
+ Hits         56165   56167    +2     
+ Misses       15129   15127    -2     

see 6 files with indirect coverage changes

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