Add install command for Digial Ocean

[aledbf]

What this PR does / why we need it:

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)

Which issue/s this PR fixes

fixes #3996

How Has This Been Tested?

Checklist:

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

[k8s-ci-robot]

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This pull-request has been approved by: aledbf

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[rihardsgrislis]

@aledbf if I previously used https://raw.githubusercontent.com/kubernetes/ingress-nginx/nginx-0.33.0/deploy/static/mandatory.yaml to install ingress-nginx do I need to run kubectl apply -f https://raw.githubusercontent.com/kubernetes/ingress-nginx/controller-v0.34.1/deploy/static/provider/do/deploy.yaml now to fill some gaps/get correct stuff or I can just change the version of the image in the controller Deployment as always?

[aledbf]

@rihardssceredins the idea is to use the static of the provider (if there is one). We tried to provide just one file to simplify the steps required to install the ingress controller.

now to fill some gaps/get correct stuff or I can just change the version of the image in the controller Deployment as always?

If you use https://raw.githubusercontent.com/kubernetes/ingress-nginx/controller-v0.34.1/deploy/static/provider/do/deploy.yaml you can run a diff and see if only the images are different.