Added link to slack channel on k8s workspace #2278

Job	Run time
Check	9m 51s
Clippy	13m 2s
Rustfmt	21s
Bench	20m 13s
Try in kind (Kubernetes in Docker)	2m 32s
Test Suite	14m 46s
Build for WASM	58s
	1h 1m 43s

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