Add deploy checklist issue template

.github/ISSUE_TEMPLATE/deploy.md

@@ -0,0 +1,30 @@
+---
+name: Deploy Colouring London
+about: Checklist for deploying an update
+title: ''
+labels: ''
+assignees: ''
+
+---
+
+Deploy checklist:
+
+- [ ] wait for CI to pass
+- [ ] log on to VPN
+- [ ] log in to staging, pull changes and build
+
+        ssh staging.colouring.london
+        sudo su - colouringlondonstaging
+        cd /var/www/colouring-london
+        git pull
+        npm ci
+        npm run build
+        pm2 restart all
+
+- [ ] user acceptance test https://clstaging.casa.ucl.ac.uk/
+- [ ] log in to production, pull changes and build as for staging
+
+Optional steps:
+
+- [ ] run database migrations
+- [ ] clear and rebuild tile cache