chore(core): update devcontainer (#23479)

Updates the devcontainer so that it has the correct version of pnpm

Fixes #20419

.devcontainer/Dockerfile

@@ -0,0 +1,7 @@
+FROM mcr.microsoft.com/devcontainers/typescript-node:20-bullseye
+
+# Update the underlying (Debian) OS, to make sure we have the latest security patches and libraries like 'GLIBC' 
+RUN sudo apt-get update  && sudo apt-get -y upgrade
+
+# Update pnpm
+RUN npm install -g pnpm@8.15.7

.devcontainer/devcontainer.json

@@ -3,7 +3,10 @@
 {
   "name": "NxDevContainer",
   // Or use a Dockerfile or Docker Compose file. More info: https://containers.dev/guide/dockerfile
-  "image": "mcr.microsoft.com/devcontainers/typescript-node:20-bullseye",
+  "build": {
+    // Path is relative to the devcontainer.json file.
+    "dockerfile": "Dockerfile"
+  },
   "features": {
     "ghcr.io/devcontainers/features/rust:1": {}
   },

.devcontainer/postCreateCommand.sh

@@ -1,11 +1,5 @@
 #!/bin/sh
 
-# Update the underlying (Debian) OS, to make sure we have the latest security patches and libraries like 'GLIBC' 
-sudo apt-get update  && sudo apt-get -y upgrade
-
-# Update pnpm
-#npm install -g pnpm
-
 # Install dependencies
 pnpm install --frozen-lockfile