Add docker image building to GitHub Actions and consolidate workflows

[woop]

What this PR does / why we need it:

• Moves docker image building into Github Actions (including docker image releases)
• Moves existing GA tests into a single workflow so that dependencies can be added between them

Does this PR introduce a user-facing change?:

NONE

[woop]

/test test-end-to-end-batch-dataflow

[woop]

/test test-end-to-end-batch-dataflow

[woop]

/test test-end-to-end-batch-dataflow

[woop]

/test test-end-to-end-batch-dataflow

[feast-ci-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: pyalex, woop

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• OWNERS [pyalex,woop]

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[pyalex]

/lgtm

[feast-ci-bot]

@woop: Updated the config configmap in namespace default at cluster default using the following files:

• key config.yaml using file .prow/config.yaml

In response to this:

What this PR does / why we need it:

• Moves docker image building into Github Actions (including docker image releases)
• Moves existing GA tests into a single workflow so that dependencies can be added between them

Does this PR introduce a user-facing change?:

NONE

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