Update devcontainer

.devcontainer/compose.yaml

@@ -0,0 +1,21 @@
+{
+  "services": {
+    "devcontainer": {
+      "command": "sh -exc 'sleep infinity'",
+      "image": "public.ecr.aws/acilearning/haskell:9.6.2",
+      "init": true,
+      "volumes": [
+        "..:/workspace",
+        "cabal-cache:/home/vscode/.cache/cabal",
+        "cabal-state:/home/vscode/.local/state/cabal"
+      ],
+      "working_dir": "/workspace"
+    }
+  },
+  "volumes": {
+    "cabal-cache": null,
+    "cabal-state": {
+      "external": true
+    }
+  }
+}

.devcontainer/devcontainer.json

@@ -0,0 +1,14 @@
+{
+  "customizations": {
+    "vscode": {
+      "extensions": [
+        "taylorfausak.purple-yolk"
+      ]
+    }
+  },
+  "dockerComposeFile": "compose.yaml",
+  "initializeCommand": "docker volume create cabal-state",
+  "postCreateCommand": "cabal update",
+  "service": "devcontainer",
+  "workspaceFolder": "/workspace"
+}