Configure Dependabot for automatic Docker and Gomod updates

[zhuxiaow0]

Enable Dependabot for Dockerfile and go.mod updates.
This will update images in Dockerfile FROM statements, and go modules.

The purpose is to drastically reduce number of vulnerabilities that affect this repo,
by keeping dependencies up-to-date.

This PR is created by a script. Please let me know if we should modify any values.

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[k8s-ci-robot]

Hi @zhuxiaow0. Thanks for your PR.

I'm waiting for a kubernetes-sigs member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

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[jkh52]

This go.mod has constraints that a robot may not be able to understand (not to get ahead of k/k go.mod).

Let's remove the /konnectivity-client entry altogether and stick with top level only for now.

[zhuxiaow0]

removed

[jkh52]

Generally this seems good but I have no experience with dependabot, is there anyone familiar that can LGTM?

/approve

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: jkh52, zhuxiaow0

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[jkh52]

/ok-to-test

[zhuxiaow0]

/retest-required

[jkh52]

/assign @cheftako

[elmiko]

i've used dependabot a bunch, my only concern here is that it will start automatically proposing updates to the go.mod, so long as we are ok with accepting the reviews around that work then i think this is a good idea.

[jkh52]

/lgtm

[zhuxiaow0]

/retest-required

[zhuxiaow0]

/retest

[jkh52]

Opened #538 for test error

[jkh52]

/retest

[jkh52]

@zhuxiaow0, this change hasn't generated any PRs that I can see. Do you see anything missing?

[zhuxiaow0]

@zhuxiaow0, this change hasn't generated any PRs that I can see. Do you see anything missing?

Hi @jkh52 , could you check in insights/dependency graph section to see if dependabot has been enabled?

[jkh52]

@zhuxiaow0, this change hasn't generated any PRs that I can see. Do you see anything missing?

Hi @jkh52 , could you check in insights/dependency graph section to see if dependabot has been enabled?

At https://github.com/kubernetes-sigs/apiserver-network-proxy/network/updates, I see "Dependabot version updates aren't configured yet". But if I click "Configure", it generates exactly the same file + contents as this PR...