Add sample drop-in config

Provide override.conf.sample as a template for customizing systemd
environment paths.

Changes:
- Rename override.conf to override.conf.sample with placeholders and comments
- Update README to instruct copying the sample

README.md

@@ -13,7 +13,7 @@ This script forwards new emails from a source IMAP account (e.g., GMX) to a dest
 4. For user services (recommended):
    - Copy services: `cp *.service *.timer ~/.config/systemd/user/`
    - Copy drop-in: `cp -r email_forwarder.service.d ~/.config/systemd/user/`
-   - Edit `~/.config/systemd/user/email_forwarder.service.d/override.conf` to set `PROJECT_DIR` to your project path.
+   - Copy `~/.config/systemd/user/email_forwarder.service.d/override.conf.sample` to `override.conf` and edit to set your PROJECT_DIR and ENV_FILE paths.
 
 5. Reload and enable: `systemctl --user daemon-reload && systemctl --user enable email_forwarder.timer && systemctl --user start email_forwarder.timer`
 

email_forwarder.service.d/override.conf

@@ -1,3 +0,0 @@
-[Service]
-Environment=PROJECT_DIR=/home/jeena/Projects/email_forwarder
-EnvironmentFile=${PROJECT_DIR}/.env

email_forwarder.service.d/override.conf.sample

@@ -0,0 +1,14 @@
+# Sample systemd drop-in configuration for email_forwarder.service
+# Copy this file to override.conf and customize the paths for your environment.
+# For Linux: Set PROJECT_DIR to your project path, ENV_FILE to ./relative/path
+# For NixOS: Set PROJECT_DIR to /var/lib/email_forwarder, ENV_FILE to /etc/email_forwarder/.env
+
+[Service]
+# Path to the email forwarder project directory
+Environment=PROJECT_DIR=/path/to/your/email_forwarder
+
+# Path to the .env file (default: ./.env relative to PROJECT_DIR)
+Environment=ENV_FILE=./.env
+
+# Load environment variables from the .env file
+EnvironmentFile=${PROJECT_DIR}/.env