[CICD]Code coverage checker fail

[jingchen2222]

Bug description

• Would you like to work on a fix? [y/n]

Caused by:
  process didn't exit successfully: `/home/runner/work/db3/db3/target/llvm-cov-target/debug/build/substrate-test-runtime-3dc7e40855a606a9/build-script-build` (exit status: 1)
  --- stderr
  Rust WASM toolchain not installed, please install it!

  Further error information:
  ------------------------------------------------------------
     Compiling wasm-test v1.0.0 (/tmp/.tmpbRfrOO)
  error[E0463]: can't find crate for `std`
    |
    = note: the `wasm32-unknown-unknown` target may not be installed
    = help: consider downloading the target with `rustup target add wasm32-unknown-unknown`
    = help: consider building the standard library from source with `cargo build -Zbuild-std`

  error: cannot find macro `println` in this scope
   --> src/main.rs:3:5
    |
  3 |                 println!("{}", env!("RUSTC_VERSION"));
    |                 ^^^^^^^

  error: requires `sized` lang_item

  For more information about this error, try `rustc --explain E0463`.
  error: could not compile `wasm-test` due to 3 previous errors
  ------------------------------------------------------------

To Reproduce

Steps to reproduce the behavior:

1. ...
2. ...
3. ...
4. ...

Expected behavior

Screenshots

Environment

• OS: [e.g. Ubuntu 20.04]
• rtstore-tpl version: [e.g. 0.1.0]

Additional context