DEVOPS-903: devex-apollo gcp migration

[pavlops]

• removed staging functionality from old pipeline.
• added devex-apollo to gcp pipeline.
• kustomize files adapted to new schemes.

[pavlops]

To note: @JamesHinshelwood

The lint is marking me to change this line:

products/devex-apollo/index.js:151:41
151:41 high Expected '===' and instead saw '=='. eslint/eqeqeq

However if I change it, I get this runtime issue:

Environment is dev
Dev env
yarn run v1.22.4
$ NODE_ENV=dev node -r dotenv/config index.js
(node:36) ExperimentalWarning: The ESM module loader is experimental.
NODE_ENV: dev
🚀  Server ready at port 5000
MongoDB database connection established successfully


/app/node_modules/mongoose/lib/helpers/promiseOrCallback.js:19
            throw error;
            ^

TypeError: Cannot read property 'customId' of undefined
    at file:///app/index.js:151:60
    at /app/node_modules/mongoose/lib/model.js:4842:16
    at /app/node_modules/mongoose/lib/helpers/promiseOrCallback.js:16:11
    at /app/node_modules/mongoose/lib/model.js:4865:21
    at /app/node_modules/mongoose/lib/query.js:4411:18
    at Immediate.<anonymous> (/app/node_modules/mongoose/lib/query.js:2145:7)
    at Immediate.<anonymous> (/app/node_modules/mquery/lib/utils.js:116:16)
    at processImmediate (internal/timers.js:456:21)
Emitted 'error' event on Function instance at:
    at /app/node_modules/mongoose/lib/model.js:4844:13
    at /app/node_modules/mongoose/lib/helpers/promiseOrCallback.js:16:11
    [... lines matching original stack trace ...]
    at processImmediate (internal/timers.js:456:21)
error Command failed with exit code 1.

If I keep the original line (https://github.com/Zilliqa/Devex-apollo/blob/master/index.js#L138) the application works fine. And this is how it was working from before:
const latestBlockInDB = res == null ? 0 : res.customId;

We can keep it like this but the Lint will fail.

Any suggestion?
Shall we ignore the Lint until some dev could take a look?

[JamesHinshelwood]

Looks good to me :)