keycloak example could use a version for keycloak and oauth2-proxy

[dylanmcreynolds]

tiled/example_configs/keycloak_oidc/compose.yaml

Line 27 in 0388f21

image: "quay.io/oauth2-proxy/oauth2-proxy"

I have been unable to get the example to work. One thing that might be going on it that I'm pulling a different version of oauth2-proxy than you are testing on...especially since this depends on alpha features.

Can you update this with the version of oauth2-proxy that works for you?