Do not overwrite existing NanoLimbo settings.yml (#3799)

Author: akippnn

files/nanolimbo-settings-patch.json

@@ -0,0 +1,12 @@
+{
+  "file": "/data/settings.yml",
+  "ops": [
+    {
+      "$set": {
+        "path": "$.bind.port",
+        "value": "${SERVER_PORT}",
+        "value-type": "int"
+      }
+    }
+  ]
+}

scripts/start-deployNanoLimbo

@@ -14,11 +14,12 @@ if ! SERVER=$(mc-image-helper github download-latest-asset \
 fi
 
 : "${SERVER_PORT:=25565}"
-cat <<EOF > /data/settings.yml
+
+if [ ! -f /data/settings.yml ]; then
+  cat <<EOF > /data/settings.yml
 #
 # NanoLimbo configuration
 #
-
 # Server's host address and port. Set ip empty to use public address
 bind:
   ip: '0.0.0.0'
@@ -157,8 +158,11 @@ traffic:
   # Ignored if -1.0
   maxPacketBytesRate: 2048.0
 EOF
+fi
+
+mc-image-helper patch --patch-env-prefix "" /image/nanolimbo-settings-patch.json
 
 export SERVER
 export FAMILY=LIMBO
 
-exec "$(dirname "$0")/start-setupMounts" "$@"
+exec "$(dirname "$0")/start-setupMounts" "$@"