chore(config): add docker-outside-of-docker, drop Rust tool version pin in

devcontainer.

Author: jiengup

.devcontainer/devcontainer.json

@@ -8,11 +8,12 @@
   "build": {
     "dockerfile": "Dockerfile",
     "context": "..",
-    "args": {
-      "RUST_VERSION": "1.96"
+  },
+  "features": {
+    "ghcr.io/devcontainers/features/docker-outside-of-docker:1": {
+      "moby": false
     }
   },
-  "features": {},
   "remoteUser": "vscode",
   "workspaceMount": "source=${localWorkspaceFolder},target=/workspaces/iggy,type=bind,consistency=cached",
   "workspaceFolder": "/workspaces/iggy",
@@ -41,7 +42,7 @@
     "8090": { "label": "TCP (binary)" },
     "8092": { "label": "WebSocket" }
   },
-  "postCreateCommand": "sudo chown -R vscode:vscode target /usr/local/cargo/registry 2>/dev/null; rustup show && npm --prefix web ci",
+  "postCreateCommand": "sudo chown vscode:vscode target /usr/local/cargo/registry; rustup show && npm --prefix web ci",
   "customizations": {
     "vscode": {
       "extensions": [