Add run_nginx check to see if file is found

frontend/Dockerfile

@@ -7,7 +7,7 @@ COPY . .
 RUN npm install
 RUN npm run build
 
-FROM nginxinc/nginx-unprivileged:1.23-alpine
+FROM nginxinc/nginx-unprivileged:1.27-alpine
 
 WORKDIR /app
 

frontend/run_nginx.sh

@@ -1,5 +1,11 @@
 #!/bin/bash
 # Substitute environment variables in the index.html file using the values in the current container environment
+
+# Check if index.html exists in the correct location
+if [ ! -f /app/index.html ]; then
+  echo "Couldn't find index.html"
+fi
+
 envsubst '
   ${VITE_AI_CONNECTION_STRING}
   ${VITE_BACKEND_URL}