diff --git a/ch32/Dockerfile b/ch32/Dockerfile
index 887c608..3fd7828 100644
--- a/ch32/Dockerfile
+++ b/ch32/Dockerfile
@@ -10,6 +10,3 @@ RUN . ${HOME}/.cargo/env && rustup install nightly && rustup component add rust-
 
 # install wlink
 RUN . ${HOME}/.cargo/env && cargo install --git https://github.com/ch32-rs/wlink
-
-# set workdir to the current directory
-WORKDIR ./
diff --git a/ch32/build.sh b/ch32/build.sh
new file mode 100755
index 0000000..9668f2d
--- /dev/null
+++ b/ch32/build.sh
@@ -0,0 +1,2 @@
+#!/bin/bash
+docker build --tag ch32-rust .