VSCode Remote SSH support

[eigmax]

After I install zkm toolchain, and connect the repo under remote vscode mode, the rust-analyzer can not finish cargo check, the error is:

--- stderr
  [zkm]  error: failed to run `rustc` to learn about target-specific information
  [zkm]  
  [zkm]  Caused by:
  [zkm]    process didn't exit successfully: `rustc - --crate-name ___ --print=file-names -C target-cpu=mips32r2 -C target-feature=+crt-static -C link-arg=-nostdlib -C link-arg=-g -C link-arg=--entry=main --target mipsel-zkm-zkvm-elf --crate-type bin --crate-type rlib --crate-type dylib --crate-type cdylib --crate-type staticlib --crate-type proc-macro --print=sysroot --print=split-debuginfo --print=crate-name --print=cfg -Wwarnings` (exit status: 1)
  [zkm]    --- stderr
  [zkm]    error: error loading target specification: could not find specification for target "mipsel-zkm-zkvm-elf"
  [zkm]      |
  [zkm]      = help: run `rustc --print target-list` for a list of built-in targets

The root cause is the rustc/cargo is not included in the $PATH. how to fix this?