packaging: create the plugin-shellcheck-core subpackage

... so that one can easily install the `run-shellcheck.sh` script
without unnecessary dependencies on `mock` etc.

Related: https://issues.redhat.com/browse/OSH-738
Closes: #185

make-srpm.sh

@@ -216,10 +216,18 @@ This package contains the semgrep plug-in for csmock.
 %package plugin-shellcheck
 Summary: csmock plug-in providing the support for ShellCheck.
 Requires: csmock-common
+Requires: csmock-plugin-shellcheck-core
 
 %description plugin-shellcheck
 This package contains the shellcheck plug-in for csmock.
 
+%package plugin-shellcheck-core
+Conflicts: csmock-plugin-shellcheck < %{version}-%{release}
+Summary: script to run shellcheck on a directory tree
+
+%description plugin-shellcheck-core
+This package contains the run-shellcheck.sh shellcheck script to run shellcheck on a directory tree.
+
 %package plugin-smatch
 Summary: csmock plug-in providing the support for smatch
 Requires: csmatch
@@ -362,10 +370,15 @@ This package contains the unicontrol plug-in for csmock.
 %{python3_sitelib}/csmock/plugins/__pycache__/semgrep.*
 
 %files plugin-shellcheck
-%{_datadir}/csmock/scripts/run-shellcheck.sh
 %{python3_sitelib}/csmock/plugins/shellcheck.py*
 %{python3_sitelib}/csmock/plugins/__pycache__/shellcheck.*
 
+%files plugin-shellcheck-core
+%license COPYING
+%dir %{_datadir}/csmock
+%dir %{_datadir}/csmock/scripts
+%{_datadir}/csmock/scripts/run-shellcheck.sh
+
 %files plugin-smatch
 %{python3_sitelib}/csmock/plugins/smatch.py*
 %{python3_sitelib}/csmock/plugins/__pycache__/smatch.*