chore(Dockerfile): Update working directory in Dockerfile

Updated the Dockerfile to change the working directory to /opt/app/build using the WORKDIR command. This ensures that the application runs from the correct directory when the container is started.

Dockerfile

@@ -28,6 +28,6 @@ ENV NODE_ENV=production
 # Copy necessary files from the "builder" stage
 EXPOSE 5000
 COPY --from=builder /opt/app/build ./build
-RUN cd build
+WORKDIR /opt/app/build
 # Define the command to run the application
 CMD ["sh", "-l", "-c", "npm run serve"]