fix(docker): write valid /etc/docker/daemon.json and add optional data-root properly

lib/docker.sh

@@ -156,9 +156,16 @@ configure_docker_daemon() {
     
     sudo mkdir -p /etc/docker
     
-    # Create optimized daemon.json
-    cat << EOF | sudo tee /etc/docker/daemon.json
+        # Create optimized daemon.json with optional data-root
+        local _data_root_line=""
+        if [[ "$DOCKER_DATA_DIR" != "${DEFAULT_DOCKER_DATA_DIR}" ]]; then
+                _data_root_line="  \"data-root\": \"${DOCKER_DATA_DIR}\","
+                log_debug "Including data-root in daemon.json: ${DOCKER_DATA_DIR}"
+        fi
+
+        sudo tee /etc/docker/daemon.json > /dev/null <<EOF
 {
+${_data_root_line}
     "storage-driver": "overlay2",
     "log-driver": "json-file",
     "log-opts": {
@@ -172,19 +179,14 @@ configure_docker_daemon() {
     "metrics-addr": "0.0.0.0:9323",
     "default-ulimits": {
         "nofile": {
-      "Hard": 64000,
             "Name": "nofile",
-      "Soft": 64000
+            "Soft": 64000,
+            "Hard": 64000
+        }
     }
 }
 EOF
     
-    # Add data-root if custom directory is specified
-    if [[ "$DOCKER_DATA_DIR" != "$DEFAULT_DOCKER_DATA_DIR" ]]; then
-        # Modify the daemon.json to include data-root
-        sudo sed -i "s|{|{\n  \"data-root\": \"$DOCKER_DATA_DIR\",|" /etc/docker/daemon.json
-    fi
-    
     # Restart Docker to apply configuration
     handle_error sudo systemctl restart docker