docker: remove unnecessary git directory cleanup

Removed the command that deletes the .git directory from the IDF_PATH to retain version control information for the submodule.

Signed-off-by: Chiho Sin <[email protected]>

Author: chihosin

Containerfile

@@ -147,7 +147,6 @@ RUN make -C ports/"${CPY_PORT}" fetch-port-submodules && git repack -d
 RUN cd ${IDF_PATH} \
     && git submodule update --init --depth=1 --recursive \
     && git repack -d \
-    && rm -rf "${IDF_PATH}"/.git \
     && cd /workspace \
     && git repack -d