shell: start shell from cmd, not entrypoint

Dev stage now requires custom entrypoint for containerd
tests so setting entrypoint would override that and make
the tests fail.

Signed-off-by: Tonis Tiigi <[email protected]>

Author: tonistiigi

hack/shell

@@ -21,4 +21,4 @@ if [ -n "$MOUNT_BUILDKIT_SOURCE" ]; then
 fi
 
 set -x
-docker run $SSH $volumes -it --privileged -v /tmp --net=host --entrypoint ash -e BUILDKIT_REGISTRY_MIRROR_DIR=/root/.cache/registry --rm $(cat $iidfile)
+docker run $SSH $volumes -it --privileged -v /tmp --net=host -e BUILDKIT_REGISTRY_MIRROR_DIR=/root/.cache/registry --rm $(cat $iidfile) ash