updated README.md

Author: HariSekhon

README.md

@@ -190,6 +190,8 @@ Environment variables are supported for convenience and also to hide credentials
 - [Google Cloud Platform](https://cloud.google.com/):
   - [gcp_cloud_function_sql_export/](https://github.com/HariSekhon/DevOps-Python-tools/tree/master/gcp_cloud_function_sql_export) - [GCF](https://cloud.google.com/functions) Python function to run [Cloud SQL](https://cloud.google.com/sql) export backups to [GCS](https://cloud.google.com/storage), subscribing to [PubSub](https://cloud.google.com/pubsub) topic that is triggered by [Cloud Scheduler](https://cloud.google.com/scheduler)
     - see the [DevOps Bash tools](https://github.com/HariSekhon/DevOps-Bash-tools/) repo for several related GCP SQL to set up service account permissions and [Cloud Scheduler](https://cloud.google.com/scheduler) jobs
+  - [gcp_cloud_function_ifconfig/](https://github.com/HariSekhon/DevOps-Python-tools/tree/master/gcp_cloud_function_ifconfig) - [GCF](https://cloud.google.com/functions) Python function to debug your Cloud Function public networking by determining which IP address your cloud function is seen as coming from
+  - [gcp_cloud_function_proxy/](https://github.com/HariSekhon/DevOps-Python-tools/tree/master/gcp_cloud_function_proxy) - [GCF](https://cloud.google.com/functions) Python function to debug your Cloud Function networking by querying a given URL to check accessibility, returning the HTTP status code and content
   - ```gcp_service_account_credential_keys.py``` - lists all GCP service account credential keys for a given project with their age and expiry details, optionally filtering by non-expiring, already expired, or will expire within N days
 - [Docker](https://www.docker.com/):
   - ```docker_registry_show_tags.py``` / ```dockerhub_show_tags.py``` / ```quay_show_tags.py``` - shows tags for docker repos in a docker registry or on [DockerHub](https://hub.docker.com/u/harisekhon/) or [Quay.io](https://quay.io/) - Docker CLI doesn't support this yet but it's a very useful thing to be able to see live on the command line or use in shell scripts (use `-q`/`--quiet` to return only the tags for easy shell scripting). You can use this to pre-download all tags of a docker image before running tests across versions in a simple bash for loop, eg. ```docker_pull_all_tags.sh```