chore: bump project version

Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "cup"
-version = "3.3.0"
+version = "3.4.0"
 edition = "2021"
 
 [dependencies]

docs/src/content/docs/configuration/automatic-refresh.mdx

@@ -1,3 +1,5 @@
+import { Callout } from "nextra/components";
+
 # Automatic refresh
 
 Cup can automatically refresh the results when running in server mode. Simply add this to your config:
@@ -9,4 +11,8 @@ Cup can automatically refresh the results when running in server mode. Simply ad
 }
 ```
 
-You can use a cron expression to specify the refresh interval. Note that seconds are not optional. The reference is [here](https://github.com/Hexagon/croner-rust#pattern)
+You can use a cron expression to specify the refresh interval. Note that seconds are not optional. The reference is [here](https://github.com/Hexagon/croner-rust#pattern).
+
+<Callout>
+    If you use a schedule with absolute time (e.g. every day at 6 AM), make sure to set the `TZ` environment variable to your [timezone](https://en.wikipedia.org/wiki/List_of_tz_database_time_zones#List).
+</Callout>

docs/src/content/docs/configuration/index.mdx

@@ -109,3 +109,36 @@ $ docker run -tv /var/run/docker.sock:/var/run/docker.sock -v /home/sergio/.conf
 ```
 
 </Steps>
+
+## Environment Variables
+
+Want to make a quick change without editing your `config.json`? Cup also supports some configuration options from environment variables.
+Here are the ones currently available:
+- `CUP_AGENT` - Agent mode
+- `CUP_IGNORE_UPDATE_TYPE` - Ignoring specific update types
+- `CUP_REFRESH_INTERVAL` - Automatic refresh
+- `CUP_SOCKET` - Socket
+- `CUP_THEME` - Theme
+
+Refer to the configuration page for more information on each of these.
+
+Here's an example of a Docker Compose file using them:
+```yaml
+services:
+  cup:
+    image: ghcr.io/sergi0g/cup:latest
+    command: serve
+    ports:
+      - 8000:8000
+    environment:
+      - CUP_AGENT: true
+      - CUP_IGNORE_UPDATE_TYPE: major
+      - CUP_REFRESH_INTERVAL: "0 */30 * * * *"
+      - CUP_SOCKET: tcp://localhost:2375
+      - CUP_THEME: blue
+```
+
+<Callout>
+    Heads up!
+    Any configuration option you set with environment variables **always** overrides anything in your `cup.json`.
+</Callout>