feat(root): add redis stats to health check #1485

Job	Run time
crystal-style / crystal-style	1m 47s
test / TODOs → GitHub Issues	25s
dockerfile-style / dockerfile-style	7s
test / crystal: latest, MT: ☐, canary: ☐	10m 42s
test / 🚧 crystal: unstable, MT: ☐, canary: ☐	15m 16s
	28m 17s

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