Add devcontainer support (#390)

.devcontainer/Dockerfile

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+# See here for image contents: https://github.com/microsoft/vscode-dev-containers/tree/v0.233.0/containers/javascript-node/.devcontainer/base.Dockerfile
+
+# [Choice] Node.js version (use -bullseye variants on local arm64/Apple Silicon): 18, 16, 14, 18-bullseye, 16-bullseye, 14-bullseye, 18-buster, 16-buster, 14-buster
+ARG VARIANT="18-bullseye"
+FROM mcr.microsoft.com/vscode/devcontainers/javascript-node:0-${VARIANT}
+
+# [Optional] Uncomment this section to install additional OS packages.
+# RUN apt-get update && export DEBIAN_FRONTEND=noninteractive \
+#     && apt-get -y install --no-install-recommends <your-package-list-here>
+
+# [Optional] Uncomment if you want to install an additional version of node using nvm
+# ARG EXTRA_NODE_VERSION=10
+# RUN su node -c "source /usr/local/share/nvm/nvm.sh && nvm install ${EXTRA_NODE_VERSION}"
+
+# [Optional] Uncomment if you want to install more global node modules
+# RUN su node -c "npm install -g <your-package-list-here>"

.devcontainer/devcontainer.json

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+// For format details, see https://aka.ms/devcontainer.json. For config options, see the README at:
+// https://github.com/microsoft/vscode-dev-containers/tree/v0.233.0/containers/javascript-node
+{
+  "name": "Node.js",
+  "build": {
+    "dockerfile": "Dockerfile",
+    // Update 'VARIANT' to pick a Node version: 18, 16, 14.
+    // Append -bullseye or -buster to pin to an OS version.
+    // Use -bullseye variants on local arm64/Apple Silicon.
+    "args": { "VARIANT": "14" }
+  },
+
+  // Set *default* container specific settings.json values on container create.
+  "settings": {},
+
+  // Add the IDs of extensions you want installed when the container is created.
+  "extensions": ["dbaeumer.vscode-eslint"],
+
+  // Use 'forwardPorts' to make a list of ports inside the container available locally.
+  "forwardPorts": [3000],
+
+  // Use 'postCreateCommand' to run commands after the container is created.
+  "postCreateCommand": "bash ./.devcontainer/postCreate.sh",
+
+  // Comment out to connect as root instead. More info: https://aka.ms/vscode-remote/containers/non-root.
+  "remoteUser": "node"
+}

.devcontainer/postCreate.sh

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+#! usr/local/env bash
+
+npm install