Make CONFIG as build-arg

Dockerfile

@@ -1,3 +1,5 @@
+ARG CONFIG=gcw0
+
 FROM debian:buster AS builder
 
 RUN apt-get update && apt-get install -y \
@@ -31,22 +33,23 @@ USER buildroot
 
 COPY --chown=buildroot:buildroot . /opt/buildroot
 
-ENV CONFIG gcw0
+ARG CONFIG
 
 RUN make od_${CONFIG}_defconfig BR2_EXTERNAL=board/opendingux
 RUN make source
 RUN make sdk BR2_SDK_PREFIX=${CONFIG}-toolchain
-RUN tar xzvf output/images/gcw0-toolchain.tar.gz
+RUN tar xzvf output/images/${CONFIG}-toolchain.tar.gz
 
 FROM debian:buster
 
 RUN apt-get update && apt-get install -y \
     file \
   && rm -rf /var/lib/apt/lists/*
 
-COPY --from=builder /opt/buildroot/gcw0-toolchain /opt/gcw0-toolchain
+ARG CONFIG
+COPY --from=builder /opt/buildroot/${CONFIG}-toolchain /opt/${CONFIG}-toolchain
 
-WORKDIR /opt/gcw0-toolchain
-ENV PATH ${PATH}:/opt/gcw0-toolchain/bin
+WORKDIR /opt/${CONFIG}-toolchain
+ENV PATH ${PATH}:/opt/${CONFIG}-toolchain/bin
 
 RUN ./relocate-sdk.sh