chore: add devcontainer config (#130)

.devcontainer/Dockerfile

@@ -0,0 +1,11 @@
+# [Choice] Debian OS version: bullseye, buster
+ARG VARIANT=bullseye
+FROM --platform=linux/amd64 mcr.microsoft.com/devcontainers/base:0-${VARIANT}
+
+ENV DENO_INSTALL=/deno
+RUN mkdir -p /deno \
+    && curl -fsSL https://deno.land/x/install/install.sh | sh \
+    && chown -R vscode /deno
+
+ENV PATH=${DENO_INSTALL}/bin:${PATH} \
+    DENO_DIR=${DENO_INSTALL}/.cache/deno

.devcontainer/devcontainer.json

@@ -0,0 +1,32 @@
+{
+  "name": "Deno",
+  "build": {
+    "dockerfile": "Dockerfile"
+  },
+
+  // Configure tool-specific properties.
+  "customizations": {
+    // Configure properties specific to VS Code.
+    "vscode": {
+      // Set *default* container specific settings.json values on container create.
+      "settings": {
+        // Enables the project as a Deno project
+        "deno.enable": true,
+        // Enables Deno linting for the project
+        "deno.lint": true,
+        // Sets Deno as the default formatter for the project
+        "editor.defaultFormatter": "denoland.vscode-deno"
+      },
+
+      // Add the IDs of extensions you want installed when the container is created.
+      "extensions": [
+        "denoland.vscode-deno"
+      ]
+    }
+  },
+
+  "remoteUser": "vscode",
+  "features": {
+    "ghcr.io/devcontainers/features/node:1": {}
+  }
+}