Fix the issue with devcontainer

Author: Prekshith-Microsoft

.devcontainer/Dockerfile

@@ -0,0 +1,4 @@
+FROM mcr.microsoft.com/devcontainers/python:3.12-bookworm
+
+# Remove Yarn repository to avoid GPG key expiration issue
+RUN rm -f /etc/apt/sources.list.d/yarn.list

.devcontainer/devcontainer.json

@@ -1,6 +1,8 @@
 {
     "name": "Real-Time Intelligence Operations Solution Accelerator Dev Container",
-    "image": "mcr.microsoft.com/devcontainers/python:3.12-bookworm",
+    "build": {
+        "dockerfile": "Dockerfile"
+    }, 
     "features": {
         "ghcr.io/devcontainers/features/azure-cli:1": {
             "version": "latest",