chore: Set CONAN_REMOTE_URL also for forks (#5662)

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

Author: Bronek

.github/workflows/libxrpl.yml

@@ -1,6 +1,6 @@
 name: Check libXRPL compatibility with Clio
 env:
-  CONAN_REMOTE_URL: ${{ vars.CONAN_REMOTE_URL }}
+  CONAN_REMOTE_URL: https://conan.ripplex.io
   CONAN_LOGIN_USERNAME_XRPLF: ${{ secrets.CONAN_REMOTE_USERNAME }}
   CONAN_PASSWORD_XRPLF: ${{ secrets.CONAN_REMOTE_PASSWORD }}
 on:

.github/workflows/macos.yml

@@ -18,7 +18,7 @@ concurrency:
 # This part of Conan configuration is specific to this workflow only; we do not want
 # to pollute conan/profiles directory with settings which might not work for others
 env:
-  CONAN_REMOTE_URL: ${{ vars.CONAN_REMOTE_URL }}
+  CONAN_REMOTE_URL: https://conan.ripplex.io
   CONAN_REMOTE_USERNAME: ${{ secrets.CONAN_REMOTE_USERNAME }}
   CONAN_REMOTE_PASSWORD: ${{ secrets.CONAN_REMOTE_PASSWORD }}
   # This part of the Conan configuration is specific to this workflow only; we

.github/workflows/nix.yml

@@ -17,7 +17,7 @@ concurrency:
   cancel-in-progress: true
 
 env:
-  CONAN_REMOTE_URL: ${{ vars.CONAN_REMOTE_URL }}
+  CONAN_REMOTE_URL: https://conan.ripplex.io
   CONAN_REMOTE_USERNAME: ${{ secrets.CONAN_REMOTE_USERNAME }}
   CONAN_REMOTE_PASSWORD: ${{ secrets.CONAN_REMOTE_PASSWORD }}
   # This part of the Conan configuration is specific to this workflow only; we

.github/workflows/windows.yml

@@ -19,7 +19,7 @@ concurrency:
   group: ${{ github.workflow }}-${{ github.ref }}
   cancel-in-progress: true
 env:
-  CONAN_REMOTE_URL: ${{ vars.CONAN_REMOTE_URL }}
+  CONAN_REMOTE_URL: https://conan.ripplex.io
   CONAN_REMOTE_USERNAME: ${{ secrets.CONAN_REMOTE_USERNAME }}
   CONAN_REMOTE_PASSWORD: ${{ secrets.CONAN_REMOTE_PASSWORD }}
   # This part of the Conan configuration is specific to this workflow only; we