Add :ro,Z to coresmd-coredns.container Corefile volume spec

[erl-hpe]

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Description

This PR adds the :ro,Z options to the volume spec for Corefile in the coresmd-coredns container file for systemd. Without these options, coresmd-coredns may fail to read the Corefile on systems where SELinux is enabled. This happened to me while developing OpenCHAMI on vTDS and caused me to have to work around it by patching the container file. With the options, coresmd-coredns has read-only access to Corefile and can read in its configuration.

This was tested on vTDS and worked correctly. The container file without this change did not work.

Fixes #39

Type of Change

• Bug fix
• New feature
• Breaking change
• Documentation update

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