docker files fixes from liaqat

src/Managing.WebApp/Dockerfile

@@ -0,0 +1,20 @@
+FROM node:18-alpine
+
+WORKDIR /app
+
+COPY . /app
+
+ENV NODE_ENV=production
+ENV VITE_API_URL_LOCAL=https://localhost:5001
+ENV VITE_API_URL_SERVER=https://localhost
+
+
+RUN npm install serve -g
+
+RUN npm install
+
+RUN npm run build
+
+EXPOSE 3000
+
+CMD ["npm", "run", "serve"]