Add Devcontainer

.devcontainer/.env

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+POSTGRES_USER=postgres
+POSTGRES_PASSWORD=postgres
+POSTGRES_DB=postgres
+POSTGRES_HOSTNAME=localhost
+POSTGRES_PORT=5432

.devcontainer/Dockerfile

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+FROM mcr.microsoft.com/devcontainers/rust:1-1-bullseye
+
+# Include lld linker to improve build times either by using environment variable
+# RUSTFLAGS="-C link-arg=-fuse-ld=lld" or with Cargo's configuration file (i.e see .cargo/config.toml).
+RUN apt-get update && export DEBIAN_FRONTEND=noninteractive \
+   && apt-get autoremove -y && apt-get clean -y

.devcontainer/devcontainer.json

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+{
+	"name": "lum",
+	"dockerComposeFile": "docker-compose.yml",
+	"service": "app",
+	"workspaceFolder": "/workspaces/${localWorkspaceFolderBasename}",
+
+	// Comment out the extensions you do not want to install
+	"customizations":{
+		"vscode": {
+			"extensions": [
+				"github.copilot-chat",
+				"github.copilot",
+				"JScearcy.rust-doc-viewer",
+				"swellaby.vscode-rust-test-adapter",
+				"Gruntfuggly.todo-tree",
+				"usernamehw.errorlens"
+			]
+		}
+	},
+
+	"remoteUser": "vscode"
+}

.devcontainer/docker-compose.yml

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+version: '3.8'
+
+volumes:
+  postgres-data:
+
+services:
+  app:
+    build:
+      context: .
+      dockerfile: Dockerfile
+    env_file:
+        # Ensure that the variables in .env match the same variables in devcontainer.json
+        - .env
+
+    volumes:
+      - ../..:/workspaces:cached
+
+    # Overrides default command so things don't shut down after the process ends.
+    command: sleep infinity
+
+    # Runs app on the same network as the database container, allows "forwardPorts" in devcontainer.json function.
+    network_mode: service:db
+
+    # Use "forwardPorts" in **devcontainer.json** to forward an app port locally. 
+    # (Adding the "ports" property to this file will not forward from a Codespace.)
+
+  db:
+    image: postgres
+    restart: unless-stopped
+    volumes:
+      - postgres-data:/var/lib/postgresql/data
+    env_file:
+        # Ensure that the variables in .env match the same variables in devcontainer.json
+        - .env
+
+    # Add "forwardPorts": ["5432"] to **devcontainer.json** to forward PostgreSQL locally.
+    # (Adding the "ports" property to this file will not forward from a Codespace.)