book: add v1.1=>v1.2 migration doc

Signed-off-by: Stefan Büringer [email protected]

docs/book/src/SUMMARY.md

@@ -58,11 +58,10 @@
         - [Multi-tenancy](./developer/architecture/controllers/multi-tenancy.md)
         - [Support multiple instances](./developer/architecture/controllers/support-multiple-instances.md)
     - [Provider Implementers](./developer/providers/implementers.md)
-        - [v1alpha1 to v1alpha2](./developer/providers/v1alpha1-to-v1alpha2.md)
-        - [v1alpha2 to v1alpha3](./developer/providers/v1alpha2-to-v1alpha3.md)
-        - [v1alpha3 to v1alpha4](./developer/providers/v1alpha3-to-v1alpha4.md)
-        - [v1alpha4 to v1beta1](./developer/providers/v1alpha4-to-v1beta1.md)
+        - [v0.3 to v0.4](./developer/providers/v0.3-to-v0.4.md)
+        - [v0.4 to v1.0](./developer/providers/v0.4-to-v1.0.md)
         - [v1.0 to v1.1](./developer/providers/v1.0-to-v1.1.md)
+        - [v1.1 to v1.2](./developer/providers/v1.1-to-v1.2.md)
         - [Cluster Infrastructure](./developer/providers/cluster-infrastructure.md)
         - [Machine Infrastructure](./developer/providers/machine-infrastructure.md)
         - [Bootstrap](./developer/providers/bootstrap.md)

docs/book/src/developer/providers/v1alpha3-to-v1alpha4.md → docs/book/src/developer/providers/v0.3-to-v0.4.md

@@ -1,4 +1,4 @@
-# Cluster API v1alpha3 compared to v1alpha4
+# Cluster API v0.3 compared to v0.4
 
 ## Minimum Go version
 

docs/book/src/developer/providers/v1alpha4-to-v1beta1.md → docs/book/src/developer/providers/v0.4-to-v1.0.md

@@ -1,4 +1,4 @@
-# Cluster API v1alpha4 compared to v1beta1
+# Cluster API v0.4 compared to v1.0
 
 ## Minimum Go version
 

docs/book/src/developer/providers/v1.1-to-v1.2.md

@@ -0,0 +1,33 @@
+# Cluster API v1.1 compared to v1.2
+
+This document provides an overview over relevant changes between ClusterAPI v1.1 and v1.2 for
+maintainers of providers and consumers of our Go API.
+
+## Minimum Go version
+
+* The Go version used by Cluster API is now Go 1.17.x
+
+## Dependencies
+
+**Note**: Only the most relevant dependencies are listed, `k8s.io/` and `ginkgo`/`gomega` dependencies
+in ClusterAPI are kept in sync with the versions used by `sigs.k8s.io/controller-runtime`. 
+
+-
+
+## Changes by Kind
+
+### Deprecation
+
+-
+
+### Removals
+
+-
+
+### API Changes
+
+-
+
+### Other
+
+-