8716 - K8s Proxy Charms

This commit contains the following changes:

- Changes to LCM Charm to configure vca k8s cloud
- K8s installation:
  - Add storageclass to K8s
  - Add k8s to VCA
  - Configure lcm.env to pass k8s cloud name
- Pass k8s cloud name to LCM Charm in charmed
installation
- Pin juju version tu 2.8/stable
- Instal juju after Microk8s in charmed
installation

Change-Id: I62ae50e4f226eba3bbda7c4a310cfe52591de5b4
Signed-off-by: Dominik Fleischmann <dominik.fleischmann@canonical.com>
diff --git a/installers/charm/lcm-k8s/config.yaml b/installers/charm/lcm-k8s/config.yaml
index c27377f..0455487 100644
--- a/installers/charm/lcm-k8s/config.yaml
+++ b/installers/charm/lcm-k8s/config.yaml
@@ -44,6 +44,10 @@
     type: string
     description: "The VCA lxd cloud name"
     default: "localhost"
+  vca_k8s_cloud:
+    type: string
+    description: "The VCA K8s cloud name"
+    default: "k8scloud"
   advertised-hostname:
     description: LCM Hostname
     type: string