feat(chart): Add default annotations for ingress nginx controller

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Description

feat(chart): Add default annotations for ingress nginx controller

Motivation and Context

By default, ingress is enabled without annotations set. If NGINX ingress controller is used, you need to set few annotations to override the default timeout values to avoid 504 errors (see #1808). Since in Selenium Grid the default of SE_NODE_SESSION_TIMEOUT and SE_SESSION_REQUEST_TIMEOUT is 300 seconds.

In order to make user experience better, there are few annotations will be set by default if NGINX ingress controller is used. Mostly relates to timeouts and buffer sizes.

If you are not using NGINX ingress controller, you can disable these default annotations by setting ingress.nginx to nil (aka null) via Helm CLI --set ingress.nginx=null) or via an override-values.yaml as below:

ingress:
  nginx:
  # nginx: null (alternative way)

Similarly, if you want to disable a sub-config of ingress.nginx. For example: --set ingress.nginx.proxyBuffer=null)

You are also able to combine using both default annotations and your own annotations in ingress.annotations. Duplicated keys will be merged strategy overwrite with your own annotations in ingress.annotations take precedence.

ingress:
  nginx:
    proxyTimeout: 360
  annotations:
    nginx.ingress.kubernetes.io/proxy-connect-timeout: "3600" # This key will take 3600 instead of 360

List mapping of chart values and default annotation(s)

# `ingress.nginx.proxyTimeout` pass value to annotation(s)
nginx.ingress.kubernetes.io/proxy-connect-timeout
nginx.ingress.kubernetes.io/proxy-send-timeout
nginx.ingress.kubernetes.io/proxy-read-timeout
nginx.ingress.kubernetes.io/proxy-next-upstream-timeout
nginx.ingress.kubernetes.io/auth-keepalive-timeout

# `ingress.nginx.proxyBuffer` pass value to to annotation(s)
nginx.ingress.kubernetes.io/proxy-request-buffering: "on"
nginx.ingress.kubernetes.io/proxy-buffering: "on"

# `ingress.nginx.proxyBuffer.size` pass value to to annotation(s)
nginx.ingress.kubernetes.io/proxy-buffer-size
nginx.ingress.kubernetes.io/client-body-buffer-size

# `ingress.nginx.proxyBuffer.number` pass value to annotation(s)
nginx.ingress.kubernetes.io/proxy-buffers-number

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Checklist

• I have read the contributing document.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have added tests to cover my changes.
• All new and existing tests passed.