ci: server: verify deps are coherent with the commit

[phymbert]

Context

It can be difficult to assess if the server dependencies are built correctly, as the files are obsucated, example:

• server: support reverse proxy setup with custom route #6325

Changes

• Run in the server CI workflow the deps.sh and verify the git index is not dirty.
• Do not allow to change the server CI workflow from a fork branch
• Change the schedule trigger to a time where github runners should be less busy
• include any files modified in the server as trigger

Tests

• If a js file is modified without updating the equivalent hpp: TEST dirty js phymbert/llama.cpp#2 https://github.com/phymbert/llama.cpp/actions/runs/8504681958/job/23291956170
• if a js file or an hpp is modified but they are not coherent: TEST: not coherent hpp phymbert/llama.cpp#3 https://github.com/phymbert/llama.cpp/actions/runs/8504643113/job/23291868220
• passing test: TEST: coherent hpp phymbert/llama.cpp#4 https://github.com/phymbert/llama.cpp/actions/runs/8504705788/job/23292025618