add POSIX shell to docker image (#2918)

Co-authored-by: pýrus <[email protected]>

Author: k8s-infra-cherrypick-robot

tools/csi-deps-check.sh

@@ -21,6 +21,7 @@ set -o errexit
 
 # This utils are using by
 # go mod k8s.io/mount-utils
+/bin/sh -c true
 /bin/mount -V
 /bin/umount -V
 /sbin/blkid -V

tools/csi-deps.sh

@@ -62,6 +62,10 @@ else
   mkdir -p ${DEST}/lib64 && cp -Lv /lib64/ld-linux-*.so.* ${DEST}/lib64/
 fi
 
+# Copy POSIX shell
+copy_deps /bin/dash
+copy_deps /bin/sh
+
 # To collect dmesg logs
 copy_deps /usr/bin/dmesg || true
 copy_deps /bin/dmesg || true