Update to install tkinter

.devcontainer/devcontainer.json

@@ -16,7 +16,7 @@
 	// Use 'forwardPorts' to make a list of ports inside the container available locally.
 	// "forwardPorts": [],
 	// Use 'postCreateCommand' to run commands after the container is created.
-	"postCreateCommand": "pip3 install --user -r requirements.txt",
+	"postCreateCommand": "sudo apt-get update; sudo apt-get -y install python3-tk; pip3 install --user -r requirements.txt",
 	// Configure tool-specific properties.
 	// "customizations": {},
 	// Uncomment to connect as root instead. More info: https://aka.ms/dev-containers-non-root.