fix(shared): remove glob from rerun condition in build.rs

[RazorBest]

The build command for crates that depend on the local shared crate always triggered the build of shared, even if nothing was modified. The issue came from the usage of rerun_if_changed, which was given the ../protobuf/* path. It doesn't support globs, and it treated * like a file name. And, when a path is not found, cargo just triggers the build every time.

This also improves the runtime of github workflows.

This is very easy to test:

• Run cargo build twice in a row, on a crate that depends on shared.
• Observe the difference in compile times between the two builds. Second time should be under 1s.
• Modify something in protobuf/ (example protobuf/README.md), and run cargo build again
• Observe that shared gets recompiled

---

Before:

cd extractors/p2p/ && cargo build
cargo build
...
    Finished `dev` profile [unoptimized + debuginfo] target(s) in 6.60s

After:

cd extractors/p2p/ && cargo build
cargo build
...
    Finished `dev` profile [unoptimized + debuginfo] target(s) in 0.12s

---

Documentation reference: https://docs.rs/cargo-build/latest/cargo_build/fn.rerun_if_changed.html

// Always rerun when non-existent file chosen

[0xB10C]

It doesn't support globs, and it treated * like a file name.

TIL! Thanks for looking into this! I had noticed this, but didn't dive deeper.

[0xB10C]

Tested this! Reduced the re-build time when re-building the whole project from 3.4s to 0.08s for me! Thank you @RazorBest!