[Docker] Start only a single service for the devcontainer

Doesn't pull the other stuff in which greatly increases startup performance and reliability

.devcontainer/devcontainer.json

@@ -1,7 +1,8 @@
 {
   "name": "E621ng project development",
-  "dockerComposeFile": "../docker-compose.yml",
-  "service": "e621",
+  "dockerComposeFile": ["../docker-compose.yml", "docker-compose.extend.yml"],
+  "service": "dev-container",
+	"overrideCommand": true,
 	"workspaceFolder": "/app",
 	"features": {
     "ghcr.io/devcontainers/features/common-utils:2": {}

.devcontainer/docker-compose.extend.yml

@@ -0,0 +1,42 @@
+version: "3"
+
+services:
+  # Dev Container extension doesn't support `depends_on: !reset []`
+  # https://github.com/microsoft/vscode-remote-release/issues/8734
+  dev-container:
+    image: e621
+    environment:
+      RAILS_ENV: development
+    volumes:
+      - .:/app
+      - ./docker/danbooru_local_config.rb:/app/config/danbooru_local_config.rb
+      - node_modules:/app/node_modules
+
+  # Don't start any other services
+  e621:
+    profiles:
+      - dev-container
+  autocompleted:
+    profiles:
+      - dev-container
+  nginx:
+    profiles:
+      - dev-container
+  postgres:
+    profiles:
+      - dev-container
+  redis:
+    profiles:
+      - dev-container
+  memcached:
+    profiles:
+      - dev-container
+  opensearch:
+    profiles:
+      - dev-container
+  iqdb:
+    profiles:
+      - dev-container
+  discord_joiner:
+    profiles:
+      - dev-container

README.md

@@ -45,9 +45,9 @@ You're most likely using Windows. Give this a shot, it tells Git to stop trackin
 
 #### <a id="development-tools"></a>Things to aid you during development
 
-`bin/rails tests` to execute the test suite.
+`docker compose run --rm tests` to execute the test suite.
 
-`bundle exec rubocop` to run the linter.
+`docker compose run --rm rubocop` to run the linter.
 
 The postgres server accepts outside connections which you can use to access it with a local client. Use `localhost:34517` to connect to a database named `e621_development` with the user `e621`. Leave the password blank, anything will work.