devcontainer and various tweaks

.devcontainer/devcontainer.json

@@ -0,0 +1,25 @@
+{
+  "name": "mail.mifi.holdings MTA-STS",
+  "image": "mcr.microsoft.com/devcontainers/javascript-node:24-bookworm",
+  "features": {
+    "ghcr.io/devcontainers/features/docker-outside-of-docker:1": {}
+  },
+  "postCreateCommand": "corepack enable && corepack prepare pnpm@10.28.2 --activate",
+  "customizations": {
+    "vscode": {
+      "extensions": [
+        "ms-azuretools.vscode-docker",
+        "esbenp.prettier-vscode"
+      ],
+      "settings": {
+        "editor.formatOnSave": true,
+        "editor.defaultFormatter": "esbenp.prettier-vscode",
+        "files.associations": {
+          "*.html": "html",
+          "*.json": "jsonc"
+        }
+      }
+    }
+  },
+  "remoteUser": "node"
+}