fix: invoke generated RPM staging helper through bash

Author: mdheller

packaging/scripts/build-rpm-package.sh

@@ -40,7 +40,7 @@ reproducible operator workflows.
 
 %install
 rm -rf %{buildroot}
-TURTLE_TERM_STAGE_PREFIX=%{buildroot}/usr TURTLE_TERM_ETC_DIR=%{buildroot}/etc TURTLE_TERM_RUNTIME_PREFIX=/usr TURTLE_TERM_RUNTIME_ETC_DIR=/etc $repo_root/packaging/scripts/stage-linux-package.sh >/dev/null
+TURTLE_TERM_STAGE_PREFIX=%{buildroot}/usr TURTLE_TERM_ETC_DIR=%{buildroot}/etc TURTLE_TERM_RUNTIME_PREFIX=/usr TURTLE_TERM_RUNTIME_ETC_DIR=/etc bash $repo_root/packaging/scripts/stage-linux-package.sh >/dev/null
 cp $repo_root/LICENSE.md %{buildroot}/LICENSE.md
 if [ -f $repo_root/THIRD_PARTY_NOTICES.md ]; then cp $repo_root/THIRD_PARTY_NOTICES.md %{buildroot}/THIRD_PARTY_NOTICES.md; fi