Create tunnel service

services/tunnel/README.md

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+# Service: Tunnel
+
+- Image: https://hub.docker.com/r/ellioseven/de-tunnel/
+- Source: https://github.com/ellioseven/de-tunnel
+
+This image is based off [localtunnel](https://localtunnel.github.io/www/)
+
+## Configuring a Tunnel
+
+Tunnels should be managed in project root `docker-compose.override.yml`. To
+configure a tunnel, specify the following:
+
+```
+version: "2"
+services:
+  tunnel:
+    extends:
+      file: ./services/tunnel/docker-compose.yml
+      service: tunnel
+    depends_on:
+      - <service>
+    environment:
+      - LT_HOST=<service>
+      - LT_PORT=<port>
+      - LT_SUBDOMAIN=<subdomain>
+```
+
+Running `make up` will create the tunnel. You can view the tunnel status with
+`docker-compose logs <tunnel-service>`
+
+The tunnel should now be viewable at `<subdomain>.localtunnel.me`
+
+### Replacements:
+
+- `<service>` Service ID, eg: `apache`
+- `<port>` Service port, eg: `80`
+- `<subdomain>` Subdomain to be created, eg: `de-apache`

services/tunnel/docker-compose.yml

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+version: "2"
+services:
+  tunnel:
+    image: ellioseven/de-tunnel