fix(devcontainer): Implement suggestions

Author: FoniksFox

.changesets/devcontainer-none.md

@@ -1,4 +1,4 @@
 release: none
 summary: Add devcontainer config and fix some things to hyperloop-firmware-toolchain
 
-Use **Ubuntu 22.04** instead of 24.04 in the package image to eliminate the ubuntu 20.04 Noble hack. Also adds **devcontainer** config and installs **stlink-server**.
+Use **Ubuntu 22.04** instead of 24.04 in the package image to eliminate the ubuntu 20.04 Focal hack. Also adds **devcontainer** config and installs **stlink-server**.

.devcontainer/devcontainer.json

@@ -4,9 +4,6 @@
     "dockerfile": "Containerfile"
   },
   "workspaceFolder": "/workspaces/${localWorkspaceFolderBasename}",
-  "runArgs": [
-    "--userns=keep-id"
-  ],
   "containerEnv": {
     "CONTAINER_NAME": "stm32-project"
   },

ci/Dockerfile

@@ -1,6 +1,6 @@
 FROM ubuntu:22.04
 
-ENV DEBIAN_FRONTEND=noninteractive
+ARG DEBIAN_FRONTEND=noninteractive
 ARG CUBECLT_VERSION=1.21.0
 ARG CUBECLT_INSTALLER=cubeclt_${CUBECLT_VERSION}_installer.sh