make `/usr/local/bin` writeable/mutable for MicroShift

[anjannath]

Currently the CI job e2e-microshift is failing on the self-sufficient bundle PR #980, with the following error:

$ ssh -o StrictHostKeyChecking=no -o UserKnownHostsFile=/dev/null -i id_ecdsa_crc core@192.168.126.11 -- 'sudo cp /home/core/systemd-units/* /etc/systemd/system/ && sudo cp /home/core/systemd-scripts/* /usr/local/bin/'
Warning: Permanently added '192.168.126.11' (ED25519) to the list of known hosts.
cp: cannot create regular file '/usr/local/bin/crc-cluster-status.sh': Read-only file system
cp: cannot create regular file '/usr/local/bin/crc-dnsmasq.sh': Read-only file system
cp: cannot create regular file '/usr/local/bin/crc-pullsecret.sh': Read-only file system
cp: cannot create regular file '/usr/local/bin/crc-routes-controller.sh': Read-only file system
cp: cannot create regular file '/usr/local/bin/crc-systemd-common.sh': Read-only file system 

we need to make the /usr/local/bin` directory mutable to be able to copy the scripts files into it, we can do it similar to what was done for the shared folder mount directory in PR #1002

We can alternatively create the scripts on /opt and set the expected Se Linux label (bin_t) to the script files but this feels messy as required label might get updated, while /usr/local/bin will always have the proper labels for executable files and can be inherited by the scripts we put there.

[anjannath]

fixed in #1018