[Arpit-Mahajan09]

Adds a manually triggered workflow (workflow_dispatch) that builds OSRM on the RISE RISC-V runners (runs-on: ubuntu-24.04-riscv).

Closes #7438.

What it does:

• Installs the toolchain and a recent CMake (via pip, since the distro CMake is too old)
• Builds vcpkg from source (VCPKG_FORCE_SYSTEM_BINARIES=1), using the riscv64-linux triplet
• Configures and builds OSRM with node bindings and LTO off
• Caches the vcpkg binary cache between runs
• Uploads vcpkg logs on failure

Run time on my fork with empty cache: 3h 11m 12s

Notes:

• It has continue-on-error: true, so it can never block anything
• Currently it is triggered manually only.
• Build only for now; running unit tests and the cucumber suite is a follow-up.
• Please install the "RISE RISC-V Runners" GitHub App to the repo.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 91.96%. Comparing base (012c4f0) to head (d92cd96).

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #7757      +/-   ##
==========================================
- Coverage   91.97%   91.96%   -0.02%     
==========================================
  Files         535      535              
  Lines       42745    42745              
==========================================
- Hits        39316    39311       -5     
- Misses       3429     3434       +5     

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[Arpit-Mahajan09]

@DennisOSRM I don't think the cd failure are caused by my code, the checks were passing before rebasing it with main, can you please review.