updates on example site to get it working with client side only

Author: ashleysmithTTD

examples/google-secure-signals-integration/uid2_client_side/.dockerignore

@@ -0,0 +1,2 @@
+node_modules
+npm-debug.log

examples/google-secure-signals-integration/uid2_client_side/Dockerfile

@@ -0,0 +1,9 @@
+FROM node:20.11.0-alpine3.18
+
+WORKDIR /usr/src/app
+
+COPY . .
+RUN npm install
+
+EXPOSE 3000
+CMD [ "npm", "start" ]