Change install command upon devcontainer startup

.devcontainer/devcontainer.json

@@ -1,22 +1,22 @@
 // For format details, see https://aka.ms/devcontainer.json. For config options, see the
 // README at: https://github.com/devcontainers/templates/tree/main/src/typescript-node
 {
-	"name": "Node.js & TypeScript",
-	// Or use a Dockerfile or Docker Compose file. More info: https://containers.dev/guide/dockerfile
-	"image": "mcr.microsoft.com/devcontainers/typescript-node:1-20-bullseye",
+  "name": "Node.js & TypeScript",
+  // Or use a Dockerfile or Docker Compose file. More info: https://containers.dev/guide/dockerfile
+  "image": "mcr.microsoft.com/devcontainers/typescript-node:1-20-bullseye",
 
-	// Features to add to the dev container. More info: https://containers.dev/features.
-	// "features": {},
+  // 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.
-	// "forwardPorts": [],
+  // 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": "npm install",
+  // Use 'postCreateCommand' to run commands after the container is created.
+  "postCreateCommand": "yarn",
 
-	// Configure tool-specific properties.
-	// "customizations": {},
+  // Configure tool-specific properties.
+  // "customizations": {},
 
-	// Uncomment to connect as root instead. More info: https://aka.ms/dev-containers-non-root.
-	"remoteUser": "root"
+  // Uncomment to connect as root instead. More info: https://aka.ms/dev-containers-non-root.
+  "remoteUser": "root"
 }