move create-clusters workflow from test-gh-actions

.github/workflows/README.md

@@ -0,0 +1,60 @@
+# Workflows
+
+## Create demo clusters for version
+
+### All options
+
+| Input                                       | Description                                | Default        |
+| ------------------------------------------- | ------------------------------------------ | -------------- |
+| [version](#version)                         | Main image version                         |                |
+| [create-k8s-cluster](#create-k8s-cluster)   | Whether to create GKE cluster              | `"false"`      |
+| [create-os4-cluster](#create-os4-cluster)   | Whether to create Open Shift 4 cluster     | `"false"`      |
+| [create-long-cluster](#create-long-cluster) | Whether to create GKE long-running cluster | `"false"`      |
+| [dry-run](#dry-run)                         | Whether it is a dry-run                    | `"false"`      |
+| [workflow-ref](#workflow-ref)                         | Reference of the called workflow                    |       |
+
+### Detailed options
+
+#### version
+
+Default value: unset
+
+#### create-k8s-cluster
+
+Default value: `false`
+
+#### create-os4-cluster
+
+Default value: `false`
+
+#### create-long-cluster
+
+Default value: `false`
+
+#### dry-run
+
+Default value: `false`
+
+#### workflow-ref
+
+Default value: unset
+
+Must match the reference of the workflow in the `uses` keyword.
+
+### Usage
+
+```yaml
+name: Create demo clusters for release candidate
+jobs:
+  create-clusters:
+    name: Setup clusters
+    uses: stackrox/actions/.github/workflows/create-cluster.yml@v1
+    secrets: inherit
+    with:
+      version: ${{github.event.inputs.version}}
+      create-k8s-cluster: ${{github.event.inputs.create-k8s-cluster == 'true'}}
+      create-os4-cluster: ${{github.event.inputs.create-os4-cluster == 'true'}}
+      create-long-cluster: ${{github.event.inputs.create-long-cluster == 'true'}}
+      dry-run: ${{github.event.inputs.dry-run == 'true'}}
+      workflow-ref: v1
+```