🐛 Fix Dockerfile syntax

Author: chomamateusz

Dockerfile

@@ -17,17 +17,16 @@ COPY backup.sh /usr/local/bin/
 RUN chmod +x /usr/local/bin/backup.sh
 
 # Set environment variables with defaults (can be overridden)
-ENV MONGODB_HOST="localhost" \
-    MONGODB_PORT="27017" \
-    MONGODB_USERNAME="" \
-    MONGODB_PASSWORD="" \
-    MONGODB_AUTH_DB="admin" \
-    S3_BUCKET="" \
-    S3_PREFIX="mongodb-backups" \
-    AWS_ACCESS_KEY_ID="" \
-    AWS_SECRET_ACCESS_KEY="" \
-    AWS_DEFAULT_REGION="us-east-1" \
-    BACKUP_RETENTION_DAYS="30"
+ENV MONGODB_HOST="localhost"
+ENV MONGODB_PORT="27017"
+ENV MONGODB_USERNAME=""
+ENV MONGODB_PASSWORD=""
+ENV MONGODB_AUTH_DB="admin"
+ENV S3_BUCKET=""
+ENV S3_PREFIX="mongodb-backups"
+ENV AWS_ACCESS_KEY_ID=""
+ENV AWS_SECRET_ACCESS_KEY=""
+ENV AWS_DEFAULT_REGION="us-east-1"
 
 # Set working directory
 WORKDIR /backup