Update Dockerfile.ChibiOS

Author: networkfusion

.devcontainer/sources/Dockerfile.ChibiOS

@@ -65,11 +65,11 @@ RUN git clone --branch mbedtls-2.28.2 https://github.com/ARMmbed/mbedtls.git --d
     && git clone --branch nf-build https://github.com/nanoframework/spiffs.git --depth 1 ./sources/spiffs
 
 # set gcc location
-ENV ARM_GCC_PATH=/usr/local/bin/gcc
-ENV PATH=$ARM_GCC_PATH/bin:${PATH}
+ARG TMP_GCC_PATH=/usr/local/bin/gcc
+ENV ARM_GCC_PATH=$TMP_GCC_PATH/bin
 
 # Copy from our other container
-COPY --from=downloader /tmp/dc-extracted/gcc $ARM_GCC_PATH
+COPY --from=downloader /tmp/dc-extracted/gcc $TMP_GCC_PATH
 COPY --from=downloader /tmp/dc-extracted/cmake /usr/bin/cmake
 
 ENV PATH=/usr/bin/cmake/bin:${PATH}