Add Openshift 4.21 to CI triggers

[mlabonte-rh]

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[github-actions]

Super-linter summary

Language	Validation result
BASH_EXEC	Pass ✅
BIOME_FORMAT	Pass ✅
BIOME_LINT	Pass ✅
GITHUB_ACTIONS	Pass ✅
GITLEAKS	Pass ✅
GIT_MERGE_CONFLICT_MARKERS	Pass ✅
MARKDOWN	Pass ✅
PRE_COMMIT	Pass ✅
PYTHON_RUFF_FORMAT	Pass ✅
SPELL_CODESPELL	Fail ❌

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SPELL_CODESPELL

/github/workspace/aws-tools/lambda/README.md:1: Lamda ==> Lambda
/github/workspace/aws-tools/start-instances.py:117: mached ==> matched
/github/workspace/helm-migration/migrate-common.sh:14: desination ==> destination
/github/workspace/homepage-container/Containerfile:16: rouge ==> rogue
/github/workspace/scripts/fix-notready-nodes.sh:18: connecto ==> connect
/github/workspace/scripts/generate-subscriptions.sh:7: approriate ==> appropriate
/github/workspace/scripts/make_common_subtree.sh:22: ANS ==> AND
/github/workspace/scripts/make_common_subtree.sh:24: ANS ==> AND