chore(deps): pin docker digests (sourcegraph#166)

Update Sourcegraph Docker images Docker tags to v2.13.5 (sourcegraph#144

)

Release 2.13.5-helm

Update Sourcegraph Docker images Docker tags to v2.13.3 (sourcegraph#143

)

Release 2.13.3-helm

Remove liveness check for sourcegraph-frontend

rename appURL -> externalURL

sourcegraph/sourcegraph@8e9dded (sourcegraph/sourcegraph#924) made this rename. See sourcegraph/sourcegraph#933.

Update Sourcegraph Docker images Docker tags to v2.13.2 (sourcegraph#138

)

Update Sourcegraph Docker images Docker tags to v2.13.1 (sourcegraph#137

)

Update Sourcegraph Docker images Docker tags to v2.13.0 (sourcegraph#136

)