Add maximumBackupCount and blobQuota configuration surface to the installer

[andrew-farries]

Description

One of the Webapp team's epics for Q2 is to use the Gitpod installer to deploy to Gitpod SaaS. In order to do that we may need to add additional configuration to the installer to make the output suitable for a SaaS deployment as opposed to a self-hosted deployment.

This PR adds configuration for two such values, maximumBackupCount and blobQuota, which are currently hard-coded in the installer but need to be configurable for SaaS.

Related Issue(s)

Part of #9097.

How to test

Build the installer and run it with

render --config /path/to/config

Where the config file contains a objectStorage configuration section including the new values, like:

objectStorage:
  inCluster: false
  maximumBackupCount: 10
  blobQuota: 2
  cloudStorage:
    project: gitpod-staging
    serviceAccount:
      kind: secret
      name: ws-sync-gcloud

The rendered output for the content-service configMap should then contain the new values under the config.json key:

- apiVersion: v1
  data:
    config.json: |-
      {
       "pprof": {
        "address": ":6060"
       },
       "prometheus": {
        "address": ":9500"
       },
       "service": {
        "address": ":8080",
        "tls": {
         "ca": "",
         "crt": "",
         "key": ""
        }
       },
       "storage": {
        "backupTrail": {
         "enabled": true,
         "maxLength": 3
        },
        "blobQuota": 2,
        "gcloud": {
         "credentialsFile": "/mnt/secrets/storage/service-account.json",
         "maximumBackupCount": 10,
         "parallelUpload": 6,
         "projectId": "gitpod-staging",
         "region": "europe-west1"
        },
        "kind": "gcloud",
        "minio": {
         "accessKey": "",
         "accessKeyFile": "",
         "endpoint": "",
         "region": "",
         "secretKey": "",
         "secretKeyFile": ""
        },
        "stage": ""
       }
      }
  kind: ConfigMap
  metadata:
    creationTimestamp: null
    labels:
      app: gitpod
      component: content-service
    name: content-service

Release Notes

Make `maximumBackupCount` and `blobQuota` configurable via the installer config file.

Documentation

No changes required as these values should be left at the pre-existing defaults to self-hosted installations.

[geropl]

Pulling workspace (in person of @kylos101 ) in here because they own the content-service.

[geropl]

@mrsimonemms Would you have time to review this? 🙏

[mrsimonemms]

@mrsimonemms Would you have time to review this? pray

@geropl anything for my friends in WebApp 🎉

[mrsimonemms]

Good work.

Is this a value we expect that a self-hosted user would be wanting to change - maybe not a small deployment, but a big bank/govt agency? If so, @gitpod-io/engineering-self-hosted may need to think about how we put this in KOTS (the "advanced" section may be enough)

[geropl]

Is this a value we expect that a self-hosted user would be wanting to change - maybe not a small deployment, but a big bank/govt agency?

@mrsimonemms Exactly where I'd put it: not interesting for Gitpod 101 Self-Hosted installation, but interesting for installs that are a bit more regulated.

[mrsimonemms]

Great - advanced section it is. That suits me as a) we don't need to do anything and b) it doesn't clutter up the config page with extra things that someone could break