devenv: create initial devcontainer

Refs: https://github.com/devcontainers/features/blob/main/.devcontainer.json

.devcontainer.json

@@ -0,0 +1,22 @@
+{
+    "image": "mcr.microsoft.com/vscode/devcontainers/javascript-node:0-18",
+    "remoteUser": "node",
+    "customizations": {
+        "vscode": {
+            "extensions": [
+				"mads-hartmann.bash-ide-vscode",
+				"bmalehorn.vscode-fish",
+				"timonwong.shellcheck",
+				"streetsidesoftware.code-spell-checker",
+				"ms-azuretools.vscode-docker"
+			]
+        }
+    },
+    "features": {
+        "ghcr.io/devcontainers/features/docker-in-docker:2": {}
+    },
+    "postCreateCommand": "npm install -g @devcontainers/cli && sudo apt-get update -y && sudo apt-get upgrade -y && sudo apt-get install -y shellcheck",
+    "hostRequirements": {
+        "cpus": 4
+    }
+}

.vscode/extensions.json

@@ -1,5 +1,9 @@
 {
     "recommendations": [
-        "timonwong.shellcheck"
+        "timonwong.shellcheck",
+        "bmalehorn.vscode-fish",
+        "ms-azuretools.vscode-docker",
+        "streetsidesoftware.code-spell-checker",
+        "mads-hartmann.bash-ide-vscode"
     ]
 }