[fix] change hello_world_host dockerfile path in gh actions

Signed-off-by: danbugs <[email protected]>

Author: danbugs

chapter02/hello_world/README.md

@@ -3,26 +3,19 @@
 ## How to build the guest?
 
 ```bash
+# from the `hello_world_guest/` directory
 cargo build --target wasm32-unknown-unknown --release
 ```
 
 ## How to run the host?
 
 ```bash
-docker run --rm -v <absolute-path-to-the-directory-containing-the-wasm-module>:/data danstaken/hello_world_host:latest /data/hello_world_guest.wasm 'Dan'
-# for me, it is: docker run --rm -v C:\Users\danil\source\repos\serverside-wasm-book-code\chapter02\hello_world\hello_world_guest:/data danstaken/hello_world_host:latest /data/hello_world_guest.wasm 'Dan'
+docker run --rm -v "$(pwd):/data" danstaken/hello_world_host:latest  /data/hello_world_guest.wasm 'Dan'
 ```
 
 You can also run locally, with:
 
 ```bash
-# from `hello_world_host` directory
+# from the `hello_world_host/` directory
 cargo run -- ../hello_world_guest/hello_world_guest.wasm 'Dan'
-```
-
-## Toolchain versions
-
-```bash
-cargo 1.79.0 (ffa9cf99a 2024-06-03)
-Docker version 24.0.7, build afdd53b
 ```