Add workflow to ensure no merge commits are included #12809

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PipelineRun: <a href="https://console.redhat.com/application-pipeline/ns/ocp-isc-tenant/pipelinerun/compliance-operator-content-on-pull-request-zvv4b" rel="nofollow">compliance-operator-content-on-pull-request-zvv4b

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Red Hat Konflux/compliance-operator-content-on-pull-request has successfully validated your commit.

Status	Duration	Name
✅ Succeeded	5 seconds	init
✅ Succeeded	39 seconds	clone-repository
✅ Succeeded	15 seconds	prefetch-dependencies
✅ Succeeded	3 minutes	build-container
✅ Succeeded	14 seconds	build-image-index
✅ Succeeded	44 seconds	sast-shell-check
✅ Succeeded	43 seconds	rpms-signature-scan
✅ Succeeded	14 seconds	push-dockerfile
✅ Succeeded	42 seconds	clamav-scan
✅ Succeeded	37 seconds	sast-unicode-check
✅ Succeeded	14 seconds	apply-tags
✅ Succeeded	13 seconds	deprecated-base-image-check
✅ Succeeded	9 seconds	sast-snyk-check
✅ Succeeded	11 seconds	coverity-availability-check
✅ Succeeded	28 seconds	clair-scan
✅ Succeeded	13 seconds	ecosystem-cert-preflight-checks
✅ Succeeded	8 seconds	show-sbom