chore: Support Github Codespaces (#2510)

Note: Update the ruby version 2.7.3. For production Linux VM, install 2.7.3 and follow the upgrade steps as shown in https://www.chatwoot.com/docs/self-hosted/deployment/linux-vm#upgrading-to-a-newer-version-of-chatwoot

.devcontainer/devcontainer.json

@@ -30,4 +30,12 @@
   // Use 'postCreateCommand' to run commands after the container is created.
   // #TODO: can we move logic of copy env file into dockerfile ?
   "postCreateCommand": "cp .env.example .env",
+  "portsAttributes": {
+    "3000": {
+      "label": "Rails Server"
+    },
+    "8025": {
+      "label": "Mailhog UI"
+    }
+  },
 }