K8SPSMDB-1132: add `spec.secrets.keyFile` field #4484

Job	Run time
runner / suggester / goimports-reviser	19s
runner / suggester / gofmt	4s
runner / suggester / golangci-lint	2m 9s
runner / alex	25s
runner / misspell	21s
runner / manifests	1m 21s
runner / shellcheck	7s
runner / suggester / shfmt	11s
	4m 57s

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