move to dockerfile instead of compose

.devcontainer/devcontainer.json

@@ -3,9 +3,10 @@
 {
 	"name": "Python 3",
 	// Or use a Dockerfile or Docker Compose file. More info: https://containers.dev/guide/dockerfile
-	"dockerComposeFile": "docker-compose.yml",
+	"build": {
+		"dockerfile": "Dockerfile"
+	},
 	"workspaceFolder": "/workspace/${localWorkspaceFolderBasename}",
-	"service": "app",
 	"customizations": {
 		"vscode": {
 			"extensions": [
@@ -18,6 +19,7 @@
 			}
 		}
 	},
+	"postStartCommand": "poetry install",
 	// Features to add to the dev container. More info: https://containers.dev/features.
 	// "features": {},
 	// Use 'forwardPorts' to make a list of ports inside the container available locally.