diff --git a/.devcontainer/codespaces/devcontainer.json b/.devcontainer/codespaces/devcontainer.json
index ca9156fdaa..6736734e60 100644
--- a/.devcontainer/codespaces/devcontainer.json
+++ b/.devcontainer/codespaces/devcontainer.json
@@ -37,7 +37,7 @@
   },
 
   "onCreateCommand": "git config --global --add safe.directory ${containerWorkspaceFolder}",
-  "postCreateCommand": ".devcontainer/post-create.sh",
+  "postCreateCommand": "bin/setup",
   "waitFor": "postCreateCommand",
 
   "customizations": {
diff --git a/.devcontainer/devcontainer.json b/.devcontainer/devcontainer.json
index 2c53be9c77..4a9cf11cc2 100644
--- a/.devcontainer/devcontainer.json
+++ b/.devcontainer/devcontainer.json
@@ -30,7 +30,7 @@
   },
 
   "onCreateCommand": "git config --global --add safe.directory ${containerWorkspaceFolder}",
-  "postCreateCommand": ".devcontainer/post-create.sh",
+  "postCreateCommand": "bin/setup",
   "waitFor": "postCreateCommand",
 
   "customizations": {
diff --git a/.devcontainer/post-create.sh b/.devcontainer/post-create.sh
deleted file mode 100755
index 82a2ccbb6c..0000000000
--- a/.devcontainer/post-create.sh
+++ /dev/null
@@ -1,27 +0,0 @@
-#!/bin/bash
-
-set -e # Fail the whole script on first error
-
-# Fetch Ruby gem dependencies
-bundle config path 'vendor/bundle'
-bundle config with 'development test'
-bundle install
-
-# Make Gemfile.lock pristine again
-git checkout -- Gemfile.lock
-
-# Fetch Javascript dependencies
-corepack prepare
-yarn install --immutable
-
-# [re]create, migrate, and seed the test database
-RAILS_ENV=test ./bin/rails db:setup
-
-# [re]create, migrate, and seed the development database
-RAILS_ENV=development ./bin/rails db:setup
-
-# Precompile assets for development
-RAILS_ENV=development ./bin/rails assets:precompile
-
-# Precompile assets for test
-RAILS_ENV=test ./bin/rails assets:precompile
diff --git a/README.md b/README.md
index 45291d6378..3773b647fe 100644
--- a/README.md
+++ b/README.md
@@ -107,7 +107,7 @@ development environment with **Docker**, complete the following steps:
 
 - Install Docker Desktop
 - Run `docker compose -f .devcontainer/docker-compose.yml up -d`
-- Run `docker compose -f .devcontainer/docker-compose.yml exec app .devcontainer/post-create.sh`
+- Run `docker compose -f .devcontainer/docker-compose.yml exec app bin/setup`
 - Finally, run `docker compose -f .devcontainer/docker-compose.yml exec app bin/dev`
 
 If you are using an IDE with [support for the Development Container specification](https://containers.dev/supporting), it will run the above `docker compose` commands automatically. For **Visual Studio Code** this requires the [Dev Container extension](https://containers.dev/supporting#dev-containers).