update: Added Longhorn installation process and updated memory allocation for VMs

update: Added 'git' and 'vagrant' to required tools in pre-flight checks

fix: configured k3s install to use internal nic for flanel network

vagrant/dev/ubuntu/k8s/nginx-test/deployment.yaml

@@ -0,0 +1,27 @@
+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: nginx-with-storage
+  namespace: default
+spec:
+  selector:
+    matchLabels:
+      app: nginx-storage
+  replicas: 1
+  template:
+    metadata:
+      labels:
+        app: nginx-storage
+    spec:
+      containers:
+      - name: nginx
+        image: nginx:stable
+        ports:
+        - containerPort: 80
+        volumeMounts:
+        - name: nginx-data
+          mountPath: /usr/share/nginx/html
+      volumes:
+      - name: nginx-data
+        persistentVolumeClaim:
+          claimName: nginx-data-pvc