Deployment configuration and v1alpha2 version

[gazarenkov]

Description

This PR includes new way to configure Backstage deployment, now (in contrary to raw config) it is possible to add the changes as a and valid "fragment" of appsv1.deployment object inside Backstage CR and those fields will be merged with default (+raw) configuration, like:

apiVersion: rhdh.redhat.com/v1alpha2
kind: Backstage
metadata:
  name: my-backstage
spec:
  deployment:
    patch:
      spec:
        template:
          metadata:
             labels:
                label1: value1
          spec:
            containers:
              - name: backstage-backend
                 resources:
                    requests:
                        cpu: 250m
                        memory: 256Mi
             - name: my-sidecar
                image: my-sidecar
            volumes:
              - ephemeral:
                  volumeClaimTemplate:
                    spec:
                      storageClassName: "my-special-class"
                name: dynamic-plugins-root

Also, since this addition causes changes in the API, new API version v1alpha2 was added. So, as for Operator versions 0.3.x and 0.4.x (if we consider 3 months release cadency and 6 months API maintain) it will support as minimum both v1alpha1 and v1alpha2 (which become a storage version). After upgrading Operator to 0.3.x the following behaviour expected:

• existed v1alpha1 CRs are working and shown as v1alpha2
• both v1alpha1 and v1alpha2 CRs can be added/updated, all shown as v1alpha2

NOTE: v1alpha2 is backward compatible with v1alpha1 w/o data conversion

Openshift NOTE: deployment.patch field won't show up in the "Form view" when creating a CR from the OCP Web. To be able to edit it with ODC use "YAML view".

Which issue(s) does this PR fix or relate to

#352

PR acceptance criteria

• Tests
• Documentation, become part of Configuration documentation #129
• If the bundle manifests have been updated, make sure to review the rhdh-operator.csv.yaml file accordingly

How to test changes / Special notes to the reviewer

• Create v1alpha2 Backstage resource as mentioned above
• Create resource on 0.2.0 version, then upgrade operator and try to update old and create new resource

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[github-actions]

⚠️ Files changed in bundle generation!

Those changes to the operator bundle manifests should have been pushed automatically to your PR branch.
You might also need to manually update the .rhdh/bundle/manifests/rhdh-operator.csv.yaml CSV file accordingly.

[github-actions]

PR images are available:

1. https://quay.io/janus-idp/operator:0.3.0-pr-388-e307937
2. https://quay.io/janus-idp/operator-bundle:0.3.0-pr-388-e307937
3. https://quay.io/janus-idp/operator-catalog:0.3.0-pr-388-e307937

[github-actions]

⚠️ Files changed in bundle generation!

Those changes to the operator bundle manifests should have been pushed automatically to your PR branch.
You might also need to manually update the .rhdh/bundle/manifests/rhdh-operator.csv.yaml CSV file accordingly.

[github-actions]

PR images are available:

1. https://quay.io/janus-idp/operator:0.3.0-pr-388-14c1b91
2. https://quay.io/janus-idp/operator-bundle:0.3.0-pr-388-14c1b91
3. https://quay.io/janus-idp/operator-catalog:0.3.0-pr-388-14c1b91

[github-actions]

PR images are available:

1. https://quay.io/janus-idp/operator:0.3.0-pr-388-a0b14b1
2. https://quay.io/janus-idp/operator-bundle:0.3.0-pr-388-a0b14b1
3. https://quay.io/janus-idp/operator-catalog:0.3.0-pr-388-a0b14b1

[github-actions]

PR images are available:

1. https://quay.io/janus-idp/operator:0.3.0-pr-388-2aa8525
2. https://quay.io/janus-idp/operator-bundle:0.3.0-pr-388-2aa8525
3. https://quay.io/janus-idp/operator-catalog:0.3.0-pr-388-2aa8525