Evaluate Knative build

[miwurster]

As a user, I want to exploit a source-to-URL workflow with Kubernetes when services are specified with a Dockerfile only.

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MICO enables the import of services based on a plain GitHub repository where a Dockerfile is hosted.
In order to deploy this service, a respective Docker image has to be built beforehand.
Here, we want to evaluate if and how we can exploit the source-to-URL workflow example by Knative.

• Ref: UI to import services from GitHub #26
• Example: https://github.com/knative/docs/tree/master/serving/samples/source-to-url-go

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Which options exist to build a Docker image based on a Dockerfile and sources on the Kubernetes cluster where also MICO is running on.

ADR discussing the options

• Kaniko
• Knative build

[davidkopp]

I wrote two ADRs that are related to this user story:

• Source-to-Image Workflow
• Building OCI Images

To summarize it: Knative Build let us achieve a source-to-image workflow in a descriptive way (describing build steps) that uses e.g. Kaniko as the Builder for the creation of the resulting image. To achieve a source-to-url workflow we would need also Knative Serving (and Istio).