Add dev container configuration

.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/devcontainers/templates/tree/main/src/javascript-node
+{
+	"name": "Python 3.12",
+
+	"dockerComposeFile": "docker-compose.yml",
+	"service": "app",
+	"workspaceFolder": "/workspace",
+	"shutdownAction": "stopCompose",
+
+	// Use 'forwardPorts' to make a list of ports inside the container available locally.
+	"forwardPorts": [
+		8000
+	],
+
+	// Configure tool-specific properties.
+	"customizations": {
+		"vscode": {
+			"extensions": [
+				"eamodio.gitlens"
+			]
+		}
+	}
+}

.devcontainer/docker-compose.yml

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+services:
+  app:
+    image: mcr.microsoft.com/devcontainers/python:3.12-bookworm
+    volumes:
+      - ..:/workspace:cached
+    command: sleep infinity
+
+  db:
+    image: postgres:17
+    restart: unless-stopped
+    volumes:
+      - postgres-data:/var/lib/postgresql/data
+    environment:
+      POSTGRES_USER: postgres
+      POSTGRES_DB: postgres
+      POSTGRES_PASSWORD: postgres
+
+volumes:
+  postgres-data: