config: add devcontainer files

.devcontainer/Dockerfile

@@ -0,0 +1,36 @@
+# [Choice] Debian OS version: bullseye, buster
+ARG VARIANT=bullseye
+FROM --platform=linux/amd64 mcr.microsoft.com/vscode/devcontainers/base:0-${VARIANT}
+
+# update system packages and cleanup cache
+ARG DEBIAN_FRONTEND=noninteractive
+
+# install gcc, git-extras, gnu coreutils
+RUN sudo apt-get -y update \
+    && sudo apt-get -y install --no-install-recommends gcc git-extras coreutils \
+    && sudo apt-get -y upgrade && sudo rm -rf /var/lib/apt/lists/*
+
+# install latest deno and upgrade to canary
+ENV DENO_INSTALL=/home/${USER:-vscode}/.local DENO_INSTALL_ROOT=${DENO_INSTALL}/bin
+RUN curl -fsSL https://deno.land/install.sh | sh \
+    && chown ${USER:-vscode} /home/${USER:-vscode}/.local/bin/deno \
+    && /home/${USER:-vscode}/.local/bin/deno upgrade canary
+
+# install brew and add to path
+RUN /bin/bash -c "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/HEAD/install.sh)" \
+    && echo 'eval "$(/home/linuxbrew/.linuxbrew/bin/brew shellenv)"' >> /home/${USER:-vscode}/.bashrc
+
+# install starship and configure some defaults
+RUN curl -fsSL https://starship.rs/install.sh | sh -s -- -y \
+    && chown ${USER:-vscode} /home/${USER:-vscode}/.local/bin/starship \
+    && { \
+        echo 'export PATH="$HOME/.local/bin:$PATH";'; \
+        echo 'export STARSHIP_CONFIG="${HOME}/.config/starship.toml";'; \
+        echo 'test -d "${HOME}/.config" || mkdir -p "${HOME}/.config";'; \
+        echo 'test -f "${STARSHIP_CONFIG}" || starship preset -o "${STARSHIP_CONFIG}" tokyo-night;'; \
+        echo 'eval "$(starship init bash)";'; \
+    } >> /home/${USER:-vscode}/.bashrc
+
+# install bash completions for deno
+RUN sudo mkdir -p /etc/bash_completion.d \
+    && /home/${USER:-vscode}/.local/bin/deno completions bash > /etc/bash_completion.d/deno.bash

.devcontainer/devcontainer.json

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+{
+  "name": "@decorators",
+  "dockerFile": "Dockerfile",
+  "remoteUser": "vscode",
+  "features": {
+    // the basics
+    "git": "latest",
+    "sshd": "latest",
+    "node": "latest",
+    // github cli
+    "ghcr.io/devcontainers/features/github-cli:1": {},
+    // github actions
+    "ghcr.io/devcontainers-contrib/features/act:1": {},
+    "ghcr.io/devcontainers-contrib/features/actionlint:1": {}
+  },
+  "build": {},
+  "updateRemoteUserUID": true,
+  // settings for the vscode editor
+  "customizations": {
+    "codespaces": {
+      "openFiles": [
+        "README.md",
+        "deno.json"
+      ]
+    },
+    "vscode": {
+      "settings": {
+        "deno.enable": true,
+        "deno.future": true, // TODO(nberlette): remove once deno 2.0 lands
+        "deno.lint": true,
+        "deno.codeLens.test": true,
+        "deno.cacheOnSave": true,
+        "deno.codeLens.testArgs": ["-A", "--no-check=remote", "--parallel", "--clean", "--doc"],
+        "editor.tabSize": 2,
+        "editor.stickyTabStops": true,
+        "editor.linkedEditing": true,
+        "editor.minimap.enabled": false,
+        "[typescript][typescriptreact][javascript][javascriptreact][json][jsonc][markdown]": {
+          "editor.defaultFormatter": "denoland.vscode-deno",
+          "editor.formatOnPaste": false,
+          "editor.formatOnSave": true
+        }
+      },
+      "extensions": [
+        "github.theme",
+        "github.vscode-github-actions",
+        "github.copilot",
+        "denoland.vscode-deno",
+        "editorconfig.editorconfig",
+        "redhat.vscode-yaml",
+        "bierner.markdown-preview-github-styles",
+        "mutantdino.resourcemonitor"
+      ]
+    }
+  },
+  "updateContentCommand": "sudo deno upgrade --canary --force 2>&1"
+}