add a devcontainer.json

.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
+FROM mcr.microsoft.com/vscode/devcontainers/ruby:0-${VARIANT}
+ARG BUNDLER_VERSION
+ARG NODE_VERSION
+ARG RAILS_VERSION
+
+# Install Rails
+RUN gem install rails:${RAILS_VERSION} 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,.preview.app.github.dev,.app.github.dev"
+
+RUN su vscode -c "source /usr/local/share/nvm/nvm.sh && nvm install ${NODE_VERSION} 2>&1"
+
+# set correct folder permissions for gems folder
+RUN chown -R vscode /usr/local/rvm/gems/default
+
+# install flyctl
+RUN su vscode -c "curl -L https://fly.io/install.sh | sh"
+ENV FLYCTL_INSTALL "/home/vscode/.fly"
+ENV PATH "$FLYCTL_INSTALL/bin:$PATH"
+
+# [Optional] Uncomment this section to install additional OS packages.
+# RUN apt-get update && export DEBIAN_FRONTEND=noninteractive \
+RUN echo "deb http://apt.postgresql.org/pub/repos/apt $(lsb_release -cs)-pgdg main" > /etc/apt/sources.list.d/pgdg.list
+RUN wget --quiet -O - https://www.postgresql.org/media/keys/ACCC4CF8.asc | apt-key add -
+RUN apt-get update && export DEBIAN_FRONTEND=noninteractive \
+    && apt-get -y install --no-install-recommends postgresql-client-15
+
+# [Optional] Uncomment this line to install additional gems.
+# RUN gem install <gems>
+
+# [Optional] Uncomment this line to install global node packages.
+# RUN su vscode -c "source /usr/local/share/nvm/nvm.sh && npm install -g <your-package-here>" 2>&1

.devcontainer/devcontainer.json

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+// For format details, see https://aka.ms/devcontainer.json. For config options, see the README at:
+// https://github.com/microsoft/vscode-dev-containers/tree/v0.224.3/containers/ruby-rails-postgres
+// Update the VARIANT arg in docker-compose.yml to pick a Ruby version
+{
+	"name": "Ruby on Rails",
+	"dockerComposeFile": "docker-compose.yml",
+	"service": "app",
+	"workspaceFolder": "/workspace",
+	"customizations": {
+		"vscode": {
+			"settings": {},
+			// Add the IDs of extensions you want installed when the container is created.
+			"extensions": [
+				"bung87.rails",
+				"Shopify.ruby-lsp"
+			]
+		}
+	},
+	// Set *default* container specific settings.json values on container create.
+	// 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],
+	// Use 'postCreateCommand' to run commands after the container is created.
+	"postCreateCommand": "",
+	// 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: .devcontainer/Dockerfile
+      args:
+        VARIANT: "3.2-bullseye"
+        NODE_VERSION: "18"
+        BUNDLER_VERSION: "2.4.6"
+        RAILS_VERSION: "7.0.5"
+
+    volumes:
+      - ..:/workspace
+
+    # Overrides default command so things don't shut down after the process ends.
+    command: sleep infinity