Decoupling Daemon External Port from healthcheck script

[SanabriaRusso]

Explain your changes:
This PR avoids using a static port for reaching the daemon's graphql endpoint. It defines an global variable for all the Functions that inherits the value from the environment, or sets it to the previously used password otherwise (i.e., 3085).

Explain how you tested your changes:
I expect to produce an artifact and check the corresponding readinessProbe in a Kubernetes deployment completes successfully.

UPDATE: Deployed a pod for devnet and confirmed two important things:

1. Node fails the ReadinessProbe at startup
2. Node passes ReadinessProbe ONLY when state returned by daemon's graphql endpoint is SYNCED.

Checklist:

• [*] Dependency versions are unchanged
  • Notify Velocity team if dependencies must change in CI
• [*] Document code purpose, how to use it
  • Mention expected invariants, implicit constraints
• All tests pass (CI will check this if you didn't)

[SanabriaRusso]

!ci-build-me

[SanabriaRusso]

Nightly https://buildkite.com/o-1-labs-2/mina-end-to-end-nightlies/builds/3381

[dkijania]

Approved with small nit

[dkijania]

NIT: looks like there is a potential to introduce single function and inject query:

function sendQraphqlQuery() {
  local __query="$1"

  echo
        curl --silent --show-error \
            --header "Content-Type:application/json" \
            -d'{ "query": "$__query" }' \
            "localhost:${DAEMON_REST_PORT}/graphql"
}

and then

function updateSyncStatusLabel() {
    sendQraphqlQuery "query { syncStatus} "  | jq '.data.syncStatus' | sed 's/"//g''
}

etc

[coveralls]

coverage: 60.754% (+0.002%) from 60.752%
when pulling fca34f6 on pod-probes
into 575904a on develop.