ShellCheck from YaST:SLE-12:SP5 project

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For openSUSE Leap 42.3 run the following as root:
zypper addrepo https://download.opensuse.org/repositories/YaST:SLE-12:SP5/openSUSE_Leap_42.3/YaST:SLE-12:SP5.repo
zypper refresh
zypper install ShellCheck