zalando-incubator / stackset-controller / 20239441570

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feature: zalando.org/forward-backend annotation support to enable migration to eks (#716)

* feature: zalando.org/forward-backend annotation support to enable migration to eks

Usage:

```
apiVersion: zalando.org/v1
kind: StackSet
metadata:
  annotations:
    zalando.org/forward-backend: eks migration
..
```

This will execute the migration preparation, such that the next traffic switch will send the traffic to the forward backend.

Signed-off-by: Sandor Szücs <sandor.szuecs@zalando.de>

* feature: externalIngress needs to be notified that we do a cluster migration, too

Signed-off-by: Sandor Szücs <sandor.szuecs@zalando.de>

* refactor: move resource patching into the stack
feature: reduce resource waste by setting replicas to 1 for the new unused stack, that will not receive any traffic

Signed-off-by: Sandor Szücs <sandor.szuecs@zalando.de>

* doc: add context how the migration will work so we will understand in the future why we scale down to 1
fix: ExternalIngress has also to get the anntoation to be set, such that it can execute a migration as expected

Signed-off-by: Sandor Szücs <sandor.szuecs@zalando.de>

* reafctor: change to pathc all resource creations

Signed-off-by: Sandor Szücs <sandor.szuecs@zalando.de>

* doc: move the migration docs

Signed-off-by: Sandor Szücs <sandor.szuecs@zalando.de>

* revert pkg/core/types.go

Signed-off-by: Sandor Szücs <sandor.szuecs@zalando.de>

* refactor: simplify test check

Signed-off-by: Sandor Szücs <sandor.szuecs@zalando.de>

* external ingress controllers should read stack.Annotations

Signed-off-by: Sandor Szücs <sandor.szuecs@zalando.de>

* deployment test

Signed-off-by: Sandor Szücs <sandor.szuecs@zalando.de>

* doc: link to ingress annotation

Signed-off-by: Sandor Szücs <sandor.szuecs@zalando.de>

* add tests

Signed-off-by: Sandor Szücs <sandor.szuecs@zalando.de>

* fix: panic if stacktemplate annotations are nil

Signed-off-by: Sandor Szücs <sandor.szuecs@zalando.de>

* fix: we do not need a ... (continued)

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