Change tag to latest, re-add features/rust

Signed-off-by: Aaron Wislang <[email protected]>

Author: asw101

.devcontainer/devcontainer.json

@@ -1,7 +1,7 @@
 {
-    "image": "ghcr.io/asw101/rust-wasi-hello-devcontainer:main",
+    "image": "ghcr.io/asw101/rust-wasi-hello-devcontainer:latest",
     "features": {
-        //"ghcr.io/devcontainers/features/rust:1": {},
+        "ghcr.io/devcontainers/features/rust:1": {},
         "ghcr.io/devcontainers/features/azure-cli:1": {}
     },
     "customizations": {