Add devcontainer settings

.devcontainer/Dockerfile

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+FROM python:3.10
+
+# Node.js
+RUN curl -fsSL https://deb.nodesource.com/setup_18.x | bash -
+RUN apt-get install -y nodejs
+RUN npm install -g vsce
+
+# Rust
+RUN curl --proto '=https' --tlsv1.2 -sSf https://sh.rustup.rs | sh -s -- -y
+ENV PATH="/root/.cargo/bin:${PATH}"
+
+# Install wasm-pack and wasm-opt
+RUN curl https://rustwasm.github.io/wasm-pack/installer/init.sh -sSf | sh
+RUN wget https://github.com/WebAssembly/binaryen/releases/download/version_113/binaryen-version_113-x86_64-linux.tar.gz && \
+    tar -zxvf binaryen-version_113-x86_64-linux.tar.gz && \
+    mv binaryen-version_113/ /root/.binaryen && \
+    rm binaryen-version_113-x86_64-linux.tar.gz
+ENV PATH="/root/.binaryen/bin:${PATH}"
+
+RUN apt-get update && apt-get install -y \
+    build-essential \
+    libssl-dev \
+    pkg-config

.devcontainer/devcontainer.json

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+{
+  "name": "dev-optuna-dashboard",
+  "dockerFile": "Dockerfile",
+  "forwardPorts": [9000],
+  "containerEnv": {},
+  "runArgs": ["--init"],
+  "postCreateCommand": "./.devcontainer/postCreateCommand.sh",
+  "customizations": {
+    "vscode": {
+      "settings": {
+        "editor.renderWhitespace": "all"
+      },
+      "extensions": [
+        "ms-python.python"
+      ]
+    }
+  }
+}

.devcontainer/postCreateCommand.sh

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+#!/bin/sh
+
+npm install
+pip install -r requirements.txt