meson.build: fix build for Debian We don't call `cargo` directly, but use a wrapper script instead, which breaks some of the expectations. Make the needed changes to ensure the package still builds.
We also need to override CARGO_HOME, so don't set this env var in meson.build.
shell-rs: build: re-generate bindings before building exe The build system provides a target named `update-rust-bindings` which can be called manually to regenerate all Rust bindings. As we want to ensure those are re-generated on Debian infra, make it a dependency of the `cargo-build` target so bindings are always re-generated at build time.
