Cloud9: Browsing your Grafana instance without exposing the instance to HTTP in security groups

When working in Cloud9 environment, there is a simple option to expose the grafana container instantiated as part of the setup_local_grafana_docker.sh to the end user without to
```
temporarily changing the Ingress rule for HTTP in your security group to "Anywhere-IPv4"
```
This can be achived by leveraging Cloud9 integrated port forwarding. See here for more details:
https://docs.aws.amazon.com/cloud9/latest/user-guide/app-preview.html#app-preview-preview-app

Simple modification of the way grafana container is instantiated to use port 8080 instead of 80:
```
docker run -d \
-p 8080:3000 \
--name=${CONTAINER_NAME} \
-v ${SCRIPT_DIR}/local_grafana_data:/var/lib/grafana \
-e "GF_INSTALL_PLUGINS=grafana-iot-twinmaker-app" \
grafana/grafana:8.2.5
```
Will enable the user to brows from his local PC to Cloud9 address (securly over HTTPS):
```
https://.vfs.cloud9..amazonaws.com/
```