This PR adds some custom logic for reading and writing
kube store values that are TLS certs and keys:
1) when store is initialized, lookup additional
TLS Secrets for this node and if found, load TLS certs
from there
2) if the node runs in certs 'read only' mode and
TLS cert and key are not found in the in-memory store,
look those up in a Secret
3) if the node runs in certs 'read only' mode, run
a daily TLS certs reload to memory to get any
renewed certs
Updates tailscale/corp#24795
Signed-off-by: Irbe Krumina <irbe@tailscale.com>
Irbe Krumina
34734ba635