Fix devcontainer

.devcontainer/Dockerfile

@@ -2,12 +2,7 @@
 
 # [Choice] Python version: 3, 3.9, 3.8, 3.7, 3.6
 ARG VARIANT="3"
-FROM mcr.microsoft.com/vscode/devcontainers/python:0-${VARIANT}
-
-# [Option] Install Node.js
-ARG INSTALL_NODE="true"
-ARG NODE_VERSION="lts/*"
-RUN if [ "${INSTALL_NODE}" = "true" ]; then su vscode -c "source /usr/local/share/nvm/nvm.sh && nvm install ${NODE_VERSION} 2>&1"; fi
+FROM mcr.microsoft.com/devcontainers/python:0-${VARIANT}
 
 # [Optional] If your pip requirements rarely change, uncomment this section to add them to the image.
 # COPY requirements.txt /tmp/pip-tmp/

.devcontainer/devcontainer.json

@@ -5,10 +5,7 @@
 		"context": "..",
 		"args": { 
 			// Update 'VARIANT' to pick a Python version: 3, 3.6, 3.7, 3.8, 3.9
-			"VARIANT": "3",
-			// Options
-			"INSTALL_NODE": "true",
-			"NODE_VERSION": "lts/*"
+			"VARIANT": "3"
 		}
 	},
 
@@ -54,7 +51,7 @@
 	// "forwardPorts": [],
 
 	// Use 'postCreateCommand' to run commands after the container is created.
-	"postCreateCommand": "npm install",
+	"postCreateCommand": "bash -i -c 'nvm install && npm ci'",
 
 	// Comment out connect as root instead. More info: https://aka.ms/vscode-remote/containers/non-root.
 	"remoteUser": "vscode"