K8SPSMDB-1132: add `spec.secrets.keyFile` field #4466

Job	Run time
runner / suggester / golangci-lint	1m 18s
runner / alex	22s
runner / suggester / gofmt	5s
runner / suggester / goimports-reviser	13s
runner / manifests	1m 6s
runner / misspell	19s
runner / shellcheck	10s
runner / suggester / shfmt	10s
	3m 43s

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