Make sure docker-compose is available in the devcontainer

This is required to run the tests.

Author: rafaelfranca

.devcontainer/devcontainer.json

@@ -8,6 +8,7 @@
 	},
 	// Features to add to the dev container. More info: https://containers.dev/features.
 	"features": {
+		"ghcr.io/devcontainers/features/docker-in-docker": {},
 		"ghcr.io/devcontainers/features/github-cli:1": {
 			"version": "latest"
 		},