Pin MicroK8s version

Pins Microk8s to 1.19

Change-Id: Ic21f1774cb7c3d8fc6362f6a4a0b95bf4f3e5e73
Signed-off-by: beierlm <mark.beierl@canonical.com>
diff --git a/installers/charmed_install.sh b/installers/charmed_install.sh
index 79899ec..00e4112 100755
--- a/installers/charmed_install.sh
+++ b/installers/charmed_install.sh
@@ -18,6 +18,7 @@
 JUJU_AGENT_VERSION=2.8.6
 K8S_CLOUD_NAME="k8s-cloud"
 KUBECTL="microk8s.kubectl"
+MICROK8S_VERSION=1.19
 IMAGES_OVERLAY_FILE=~/.osm/images-overlay.yaml
 PATH=/snap/bin:${PATH}
 
@@ -42,7 +43,7 @@
 
 function install_snaps(){
     if [ ! -v KUBECFG ]; then
-        sudo snap install microk8s --classic
+        sudo snap install microk8s --classic --channel=${MICROK8S_VERSION}/stable
         sudo usermod -a -G microk8s `whoami`
         mkdir -p ~/.kube
         sudo chown -f -R `whoami` ~/.kube