Use a higher port number for rollup.

.devcontainer/devcontainer.json

@@ -5,7 +5,7 @@
   "workspaceFolder": "${localWorkspaceFolder}",
   "shutdownAction": "stopCompose",
   "portsAttributes": {
-    "1000": {
+    "10001": {
       "label": "Rollup",
       "onAutoForward": "silent"
     },
@@ -18,7 +18,7 @@
       "onAutoForward": "silent"
     }
   },
-  "forwardPorts": [1000, "hass:8123", "frigate:5000"],
+  "forwardPorts": [10001, "hass:8123", "frigate:5000"],
   "initializeCommand": ".devcontainer/initialize.sh",
   "postCreateCommand": "yarn install",
   "extensions": [

.devcontainer/preconfig/.storage/lovelace_resources

@@ -5,7 +5,7 @@
   "data": {
     "items": [
       {
-        "url": "http://localhost:1000/frigate-hass-card.js",
+        "url": "http://localhost:10001/frigate-hass-card.js",
         "type": "module",
         "id": "00c459541bac4290af01c51bf9c06ba1"
       }

rollup.config.js

@@ -19,7 +19,7 @@ const dev = watch || process.env.DEV === 'true' || process.env.DEV === '1';
 const serveopts = {
   contentBase: ['./dist'],
   host: '0.0.0.0',
-  port: 1000,
+  port: 10001,
   allowCrossOrigin: true,
   headers: {
     'Access-Control-Allow-Origin': '*',