refactor(upgrade): improve upgrade script

- remove unused VERSION variable.
- add backup functionality of the .env file on each run of the upgrade script.
- skip .env backup when coming from the install script
- add improved handling and more logging for updating environment-variable values.
- remove not needed line

scripts/upgrade.sh

@@ -1,11 +1,12 @@
 #!/bin/bash
 ## Do not modify this file. You will lose the ability to autoupdate!
 
-VERSION="15"
 CDN="https://cdn.coollabs.io/coolify"
 LATEST_IMAGE=${1:-latest}
 LATEST_HELPER_VERSION=${2:-latest}
 REGISTRY_URL=${3:-ghcr.io}
+SKIP_BACKUP=${4:-false}
+ENV_FILE="/data/coolify/source/.env"
 
 DATE=$(date +%Y-%m-%d-%H-%M-%S)
 LOGFILE="/data/coolify/source/upgrade-${DATE}.log"
@@ -14,20 +15,39 @@ curl -fsSL $CDN/docker-compose.yml -o /data/coolify/source/docker-compose.yml
 curl -fsSL $CDN/docker-compose.prod.yml -o /data/coolify/source/docker-compose.prod.yml
 curl -fsSL $CDN/.env.production -o /data/coolify/source/.env.production
 
-# Merge .env and .env.production. New values will be added to .env
+# Backup existing .env file before making any changes
-awk -F '=' '!seen[$1]++' /data/coolify/source/.env /data/coolify/source/.env.production >/data/coolify/source/.env.tmp && mv /data/coolify/source/.env.tmp /data/coolify/source/.env
+if [ "$SKIP_BACKUP" != "true" ]; then
-# Check if PUSHER_APP_ID or PUSHER_APP_KEY or PUSHER_APP_SECRET is empty in /data/coolify/source/.env
+    if [ -f "$ENV_FILE" ]; then
-if grep -q "PUSHER_APP_ID=$" /data/coolify/source/.env; then
+        echo "Creating backup of existing .env file to .env-$DATE" >>$LOGFILE
-    sed -i "s|PUSHER_APP_ID=.*|PUSHER_APP_ID=$(openssl rand -hex 32)|g" /data/coolify/source/.env
+        cp $ENV_FILE $ENV_FILE-$DATE
+    else
+        echo "No existing .env file found to backup" >>$LOGFILE
+    fi
 fi
 
-if grep -q "PUSHER_APP_KEY=$" /data/coolify/source/.env; then
+echo "Merging .env.production values into .env" >>$LOGFILE
-    sed -i "s|PUSHER_APP_KEY=.*|PUSHER_APP_KEY=$(openssl rand -hex 32)|g" /data/coolify/source/.env
+awk -F '=' '!seen[$1]++' $ENV_FILE /data/coolify/source/.env.production > $ENV_FILE.tmp && mv $ENV_FILE.tmp $ENV_FILE
-fi
+echo ".env file merged successfully" >>$LOGFILE
 
-if grep -q "PUSHER_APP_SECRET=$" /data/coolify/source/.env; then
+update_env_var() {
-    sed -i "s|PUSHER_APP_SECRET=.*|PUSHER_APP_SECRET=$(openssl rand -hex 32)|g" /data/coolify/source/.env
+    local key="$1"
-fi
+    local value="$2"
+
+    # If variable "key=" exists but has no value, update the value of the existing line
+    if grep -q "^${key}=$" "$ENV_FILE"; then
+        sed -i "s|^${key}=$|${key}=${value}|" "$ENV_FILE"
+        echo " - Updated value of ${key} as the current value was empty" >>$LOGFILE
+    # If variable "key=" doesn't exist, append it to the file with value
+    elif ! grep -q "^${key}=" "$ENV_FILE"; then
+        printf '%s=%s\n' "$key" "$value" >>"$ENV_FILE"
+        echo " - Added ${key} with default value as the variable was missing" >>$LOGFILE
+    fi
+}
+
+echo "Checking and updating environment variables if necessary..." >>$LOGFILE
+update_env_var "PUSHER_APP_ID" "$(openssl rand -hex 32)"
+update_env_var "PUSHER_APP_KEY" "$(openssl rand -hex 32)"
+update_env_var "PUSHER_APP_SECRET" "$(openssl rand -hex 32)"
 
 # Make sure coolify network exists
 # It is created when starting Coolify with docker compose
@@ -37,7 +57,6 @@ if ! docker network inspect coolify >/dev/null 2>&1; then
         docker network create --attachable coolify 2>/dev/null
     fi
 fi
-# docker network create --attachable --driver=overlay coolify-overlay 2>/dev/null
 
 # Check if Docker config file exists
 DOCKER_CONFIG_MOUNT=""