chore(env): Adding required env inside chaosengine (#479)

Signed-off-by: shubhamchaudhary <shubham@chaosnative.com>

charts/generic/disk-fill/engine.yaml

@@ -18,10 +18,17 @@ spec:
       spec:
         components:
           env:
+            - name: TOTAL_CHAOS_DURATION
+              value: '60' 
+
             # specify the fill percentage according to the disk pressure required
             - name: FILL_PERCENTAGE
               value: '80'
-              
-            - name: TARGET_CONTAINER
-              value: 'nginx'
-              
+
+            - name: PODS_AFFECTED_PERC
+              value: ''
+
+            # Provide the container runtime path
+            # Default set to docker container path
+            - name: CONTAINER_PATH
+              value: '/var/lib/docker/containers'