improve readme

Author: JRoy

.gitignore

@@ -1,3 +1,4 @@
 .idea/
 node_modules/
 .storage
+.wrangler

README.md

@@ -6,6 +6,16 @@ You can use this Cloudflare worker by following the steps after clicking the but
 [![Deploy to Cloudflare Workers](https://deploy.workers.cloudflare.com/button)](https://deploy.workers.cloudflare.com/?url=https://github.com/JRoy/disgit)
 
 
+You can also deploy this using docker/docker-compose by cloning this repo and running
+`docker compose up --build -d`. The worker will be started on port 8080.
+
+## Environment Variables
+digit has the following optional environment variables that you can use to customize your instance;
+- `IGNORED_BRANCHES_REGEX` - A regex pattern for branches that should be ignored
+- `IGNORED_BRANCHES` - A comma seperated list of branches that should be ignored
+- `IGNORED_USERS` - A comma seperated list of users that should be ignored
+- `IGNORED_PAYLOADS` - A comma seperated list of webhook events that should be ignored
+
 ## Supported Events
 The following webhook events are supported as of now;
 * [check_run](https://docs.github.com/en/developers/webhooks-and-events/webhook-events-and-payloads#check_run)