ci: create script to update DNS records from hashes.txt (#3458)

Description
---
Provides a script that can update DNS TXT records from `meta/hashes.txt` file using Cloudflare API

Motivation and Context
---
Part of the release process once auto updates are working 

How Has This Been Tested?
---
Manually 

https://www.digwebinterface.com/?hostnames=updates.taripulse.com&type=TXT&ns=resolver&useresolver=1.1.1.1

applications/dns/.env.sample

@@ -0,0 +1,4 @@
+TOKEN=
+ZONE_ID=
+DOMAIN=updates.taripulse.com
+FILE=../../meta/hashes.txt

applications/dns/.nvmrc

@@ -0,0 +1 @@
+lts/fermium

applications/dns/README.md

@@ -0,0 +1,34 @@
+# DNS Update
+
+A script to update DNS records from the hashes file.
+
+## Setup your env
+
+```
+cp .env.sample .env
+```
+
+- Edit `.env` to include your cloudflare api TOKEN, your ZONE_ID, and the DOMAIN to update.
+- Use FILE to set the name of the file to provide records, if not provided then the default `../../meta/hashes.txt` will be used.
+
+## Install deps
+
+```
+npm ci
+```
+
+## Run
+
+```
+npm run update
+```
+
+Deletes existing TXT records on the domain, and creates new records from each line in FILE.
+
+## Release process (manual)
+
+- push tag
+- build binaries
+- replace hashes in file `meta/hashes.txt`
+- sign `meta/hashes.txt` with maintainer gpg key and replace sig at `meta/hashes.txt.sig`
+- `npm run update` in this folder to update the DNS records to match the txt file