Tailscale reverse proxy proof of concept.
Three different attempts at getting Tailscale to work in Cloudrun / GKE.
Generate an ephemeral key.
gcloud builds submit --config=cloudbuild.yaml \
--substitutions=_TAILSCALE_AUTH="tskey-123456789abcedef",_TAILSCALE_ENDPOINT="http:https://[fd7a:115c:a1e0:ab12:1234:1234:1234:1234]:5000"