Dockerfile improvments and fixes

Author: lukstep

docker/Dockerfile

@@ -14,18 +14,19 @@ RUN apk update && \
             gcc-arm-none-eabi
 
 # Raspberry Pi Pico SDK
-RUN git clone https://github.com/raspberrypi/pico-sdk /usr/pico-sdk && \
-    cd /usr/pico-sdk  && \
+ARG SDK_PATH=/usr/share/pico_sdk
+RUN git clone https://github.com/raspberrypi/pico-sdk $SDK_PATH && \
+    cd $SDK_PATH && \
     git submodule update --init
 
-ENV PICO_SDK_PATH=/usr/pico-sdk
+ENV PICO_SDK_PATH=$SDK_PATH
 
 # Picotool installation
-RUN git clone -b master https://github.com/raspberrypi/picotool.git /usr/picotool && \
-    cd /usr/picotool && \
+RUN git clone -b master https://github.com/raspberrypi/picotool.git /home/picotool && \
+    cd /home/picotool && \
     mkdir build && \
     cd build && \
     cmake .. && \
     make && \
-    cp /usr/picotool/build/picotool /bin/picotool && \
-    rm -rf /usr/picotool
+    cp /home/picotool/build/picotool /bin/picotool && \
+    rm -rf /home/picotool