added prow jobs for dependency-watchdog

[unmarshall]

/kind enhancement

What this PR does / why we need it:
This PR adds prow jobs for unit tests and image builds of dependency-watchdog repository.
Which issue(s) this PR fixes:
Fixes #

Special notes for your reviewer:

[rfranzke]

@oliver-goetz Do we want/are we ready to let further repositories be managed via Prow? IIRC, last time we decided to only manage g/g and a few extensions until we have more maintainers. Is this still up-to-date?

[unmarshall]

/invite @oliver-goetz

[oliver-goetz]

There are some basic labels and plugins required for prow to work for a repository.
Please check what Dimitar did in plugins.yaml, labels.yaml and ci-infra-periodics.yaml for enabling gardener-extension-shoot-oidc-service see PR #157

[oliver-goetz]

@oliver-goetz Do we want/are we ready to let further repositories be managed via Prow? IIRC, last time we decided to only manage g/g and a few extensions until we have more maintainers. Is this still up-to-date?

There is only very maintenance effort for us when there are only a couple of prow jobs sharing the same pattern we use for gardener/gardener. That's the same setup as gardener-extension-shoot-oidc-service Dimitar added a while ago.

There will be more effort when other repositories would like to enable the full prow functionality including tide and other github integrations. For this we might need more maintainers. Maybe Dimitar, Madhav or other people from Bangalore team could help, when we come to this point.

[oliver-goetz]

/kind enhancement

[oliver-goetz]

There are too many labels and plugins for the "testing only" scenario in prow.

[oliver-goetz]

/lgtm

[gardener-prow]

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[gardener-prow]

@unmarshall: Updated the following 2 configmaps:

• job-config configmap in namespace prow at cluster gardener-prow-trusted using the following files:
  • key ci-infra-periodics.yaml using file config/jobs/ci-infra/ci-infra-periodics.yaml
  • key dependency-watchdog-build-dev-images.yaml using file config/jobs/dependency-watchdog/dependency-watchdog-build-dev-images.yaml
  • key dependency-watchdog-check-vulnerabilities.yaml using file config/jobs/dependency-watchdog/dependency-watchdog-check-vulnerabilities.yaml
  • key dependency-watchdog-test-builds.yaml using file config/jobs/dependency-watchdog/dependency-watchdog-test-builds.yaml
  • key dependency-watchdog-unit-tests.yaml using file config/jobs/dependency-watchdog/dependency-watchdog-unit-tests.yaml
• plugins configmap in namespace prow at cluster gardener-prow-trusted using the following files:
  • key plugins.yaml using file config/prow/plugins.yaml

In response to this:

/kind enhancement

What this PR does / why we need it:
This PR adds prow jobs for unit tests and image builds of dependency-watchdog repository.
Which issue(s) this PR fixes:
Fixes #

Special notes for your reviewer:

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