Make exmaple compose file self-sufficient

config/default.env

@@ -1 +0,0 @@
-PASSWORD=my_password

docker-compose.yml

@@ -1,31 +1,30 @@
 services:
   backup:
+    image: ghcr.io/schmelczer/backup-container:latest
     container_name: backup
     init: true
     tty: true
-    build:
-      context: .
     environment:
       - TZ=Europe/London
       - SLEEP_TIME=1h # we will wait an hour between backups
 
       # first backup goes to rsync.net
-      - BORG_PASSPHRASE_0=$PASSWORD
+      - BORG_PASSPHRASE_0=MY_PASSWORD_CHANGE_THIS
       - BORG_REMOTE_PATH_0=borg1 # we must use this executable in the rsync.net host
-      - BORG_REPO_0=my-username@my-username.rsync.net:~/backup
+      - BORG_REPO_0=change-this-username@change-this-username.rsync.net:~/backup
 
       # second backup goes to a local path
-      - BORG_PASSPHRASE_1=$PASSWORD
+      - BORG_PASSPHRASE_1=MY_PASSWORD_CHANGE_THIS
       - BORG_REPO_1=/local-backup
 
       # the following are passed to `borg prune`
       - KEEP_DAILY=6 # default: 6
       - KEEP_WEEKLY=3 # default: 3
       - KEEP_MONTHLY=48 # default: 48
-      - KEEP_YEARLY=10 # default: 0
+      - KEEP_YEARLY=10 # default: 0 (!)
     volumes:
-      - /volumes:/source:ro # we will backup this folder, we mustn't change it, so it's readonly
-      - /volumes/backup:/snapshot # we must mount a btrfs path for the snapshot to be put at, this is just a temporary path
+      - /volumes:/source:ro # we backup this folder (which is a BTRFS volume), we mustn't change it, so it's readonly
+      - /volumes/backup:/snapshot # we must mount a path to a folder on the BTRFS disk for the snapshot to be put at, this is just a temporary path
       - /volumes/backup/logs:/backup-logs # we will store the output of the backup commands in this folder
       - borg-cache:/root/.cache/borg # speed up subsequent backups
 
@@ -33,7 +32,7 @@ services:
       - /volumes/backup/config/id_rsa:/root/.ssh/id_rsa # this is an example for mounting an ssh key for a remote repo (BORG_REPO_0 above)
 
     cap_add:
-      - SYS_ADMIN # we need this capability to snapshot a btrfs volume
+      - SYS_ADMIN # we need this capability to snapshot a BTRFS volume
     restart: unless-stopped
 
 volumes: