Add devcontainer for Docker development

Author: alexrudall

.devcontainer/Dockerfile

@@ -0,0 +1,16 @@
+FROM ruby:3.2.2-slim-bullseye
+
+ENV TZ="Europe/London"
+
+RUN apt-get update && export DEBIAN_FRONTEND=noninteractive \
+  && apt-get -y install --no-install-recommends \
+  apt-utils \
+  build-essential \
+  curl \
+  git \
+  vim \
+  zsh
+
+RUN gem install bundler
+
+WORKDIR /workspace

.devcontainer/devcontainer.json

@@ -0,0 +1,36 @@
+// For format details, see https://aka.ms/devcontainer.json. For config options, see the README at:
+// https://github.com/microsoft/vscode-dev-containers/tree/v0.245.2/containers/ruby-rails-postgres
+// Update the VARIANT arg in docker-compose.yml to pick a Ruby version
+{
+  "name": "ruby-openai",
+  "dockerComposeFile": "docker-compose.yml",
+  "service": "app",
+  "workspaceFolder": "/workspace",
+  "containerEnv": {
+    "GITHUB_TOKEN": "${localEnv:GITHUB_TOKEN}",
+    "GITHUB_USER": "${localEnv:GITHUB_USER}"
+  },
+  // Configure tool-specific properties.
+  "customizations": {
+    // Configure properties specific to VS Code.
+    "vscode": {
+      // Add the IDs of extensions you want installed when the container is created.
+      "extensions": [
+        "rebornix.Ruby",
+        "sleistner.vscode-fileutils",
+        "ms-azuretools.vscode-docker",
+        "samverschueren.final-newline",
+        "GitHub.copilot",
+        "usernamehw.remove-empty-lines",
+        "wingrunr21.vscode-ruby",
+      ]
+    }
+  },
+  // Use 'postCreateCommand' to run commands after the container is created.
+  "postCreateCommand": "bundle install",
+  // Comment out to connect as root instead. More info: https://aka.ms/vscode-remote/containers/non-root.
+  "features": {
+    "git": "os-provided",
+    "github-cli": "latest"
+  }
+}

.devcontainer/docker-compose.yml

@@ -0,0 +1,19 @@
+version: "3"
+
+services:
+  app:
+    build:
+      context: ..
+      dockerfile: .devcontainer/Dockerfile
+
+    volumes:
+      - ..:/workspace:cached
+      - bundle_cache:/bundle
+
+    command: sleep infinity
+
+    environment:
+      TZ: Europe/London
+
+volumes:
+  bundle_cache: