Add DevContainer config (#17764)

* Add DevContainer config

* Add `--path vendor/bundle` to `postCreateCommand`

.devcontainer/Dockerfile

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+# [Choice] Ruby version (use -bullseye variants on local arm64/Apple Silicon): 3, 3.1, 3.0, 2, 2.7, 2.6, 3-bullseye, 3.1-bullseye, 3.0-bullseye, 2-bullseye, 2.7-bullseye, 2.6-bullseye, 3-buster, 3.1-buster, 3.0-buster, 2-buster, 2.7-buster, 2.6-buster
+ARG VARIANT=3.1-bullseye
+FROM mcr.microsoft.com/vscode/devcontainers/ruby:${VARIANT}
+
+# Install Rails
+# RUN gem install rails webdrivers
+
+# Default value to allow debug server to serve content over GitHub Codespace's port forwarding service
+# The value is a comma-separated list of allowed domains
+ENV RAILS_DEVELOPMENT_HOSTS=".githubpreview.dev"
+
+# [Choice] Node.js version: lts/*, 16, 14, 12, 10
+ARG NODE_VERSION="lts/*"
+RUN su vscode -c "source /usr/local/share/nvm/nvm.sh && nvm install ${NODE_VERSION} 2>&1"
+
+# [Optional] Uncomment this section to install additional OS packages.
+RUN apt-get update && export DEBIAN_FRONTEND=noninteractive \
+    && apt-get -y install --no-install-recommends libicu-dev libidn11-dev ffmpeg imagemagick libpam-dev
+
+# [Optional] Uncomment this line to install additional gems.
+RUN gem install foreman
+
+# [Optional] Uncomment this line to install global node packages.
+RUN su vscode -c "source /usr/local/share/nvm/nvm.sh && npm install -g yarn" 2>&1

.devcontainer/devcontainer.json

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+{
+  "name": "Mastodon",
+  "dockerComposeFile": "docker-compose.yml",
+  "service": "app",
+  "workspaceFolder": "/workspaces/mastodon",
+
+  // 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": [
+    "EditorConfig.EditorConfig",
+    "dbaeumer.vscode-eslint",
+		"rebornix.Ruby"
+	],
+
+  // Use 'forwardPorts' to make a list of ports inside the container available locally.
+	// This can be used to network with other containers or the host.
+	"forwardPorts": [3000, 4000],
+
+	// Use 'postCreateCommand' to run commands after the container is created.
+	"postCreateCommand": "bundle install --path vendor/bundle && yarn install && ./bin/rails db:setup",
+
+	// Comment out to connect as root instead. More info: https://aka.ms/vscode-remote/containers/non-root.
+	"remoteUser": "vscode"
+}

.devcontainer/docker-compose.yml

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+version: '3'
+
+services:
+  app:
+    build:
+      context: .
+      dockerfile: Dockerfile
+      args:
+        # Update 'VARIANT' to pick a version of Ruby: 3, 3.1, 3.0, 2, 2.7, 2.6
+        # Append -bullseye or -buster to pin to an OS version.
+        # Use -bullseye variants on local arm64/Apple Silicon.
+        VARIANT: "3.0-bullseye"
+        # Optional Node.js version to install
+        NODE_VERSION: "14"
+    volumes:
+      - ..:/workspaces/mastodon:cached
+    environment:
+      RAILS_ENV: development
+      NODE_ENV: development
+
+      REDIS_HOST: redis
+      REDIS_PORT: '6379'
+      DB_HOST: db
+      DB_USER: postgres
+      DB_PASS: postgres
+      DB_PORT: '5432'
+      ES_ENABLED: 'true'
+      ES_HOST: es
+      ES_PORT: '9200'
+    # Overrides default command so things don't shut down after the process ends.
+    command: sleep infinity
+    networks:
+      - external_network
+      - internal_network
+    user: vscode
+
+
+  db:
+    image: postgres:14-alpine
+    restart: unless-stopped
+    volumes:
+      - postgres-data:/var/lib/postgresql/data
+    environment:
+      POSTGRES_USER: postgres
+      POSTGRES_DB: postgres
+      POSTGRES_PASSWORD: postgres
+      POSTGRES_HOST_AUTH_METHOD: trust
+    networks:
+      - internal_network
+
+  redis:
+    image: redis:6-alpine
+    restart: unless-stopped
+    volumes:
+      - redis-data:/data
+    networks:
+      - internal_network
+
+  es:
+    image: docker.elastic.co/elasticsearch/elasticsearch-oss:7.10.2
+    restart: unless-stopped
+    environment:
+      ES_JAVA_OPTS: -Xms512m -Xmx512m
+      cluster.name: es-mastodon
+      discovery.type: single-node
+      bootstrap.memory_lock: 'true'
+    volumes:
+      - es-data:/usr/share/elasticsearch/data
+    networks:
+      - internal_network
+    ulimits:
+      memlock:
+        soft: -1
+        hard: -1
+
+volumes:
+  postgres-data:
+  redis-data:
+  es-data:
+
+networks:
+  external_network:
+  internal_network:
+    internal: true