Use mkdir -p in setup scripts to allow idempotent re-runs (#7737)

Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com>
Co-authored-by: maxtropets <16566519+maxtropets@users.noreply.github.com>

Author: Copilot

scripts/setup-ci.sh

@@ -48,7 +48,7 @@ tdnf --snapshottime=$SOURCE_DATE_EPOCH -y install procps
 tdnf --snapshottime=$SOURCE_DATE_EPOCH install -y bind-utils
 curl -L --output h2spec_linux_amd64.tar.gz https://github.com/summerwind/h2spec/releases/download/$H2SPEC_VERSION/h2spec_linux_amd64.tar.gz
 tar -xvf h2spec_linux_amd64.tar.gz
-mkdir /opt/h2spec
+mkdir -p /opt/h2spec
 mv h2spec /opt/h2spec/h2spec
 rm h2spec_linux_amd64.tar.gz