Mounting docker volume in docker script causes a problem

`docker run -v $(pwd)/specs/default/cluster-init/files:/source -v $(pwd)/blobs:/root/rpmbuild/RPMS/x86_64 -ti centos:7 /bin/bash /source/00-build-slurm.sh` triggers the error:
/bin/bash: /source/00-build-slurm.sh: Permission denied

because inside docker the privilliges of source dir are the following

[root@11d3f968ca8c /]# ll
total 12
-rw-r--r--. 1 root root 12082 Mar 5 17:36 anaconda-post.log
drwxrwxr-x. 2 1002 1002 49 Apr 11 12:55 source