Add a new app: QR code generator for campaign (#75)

* Initialize a new NX project - QR campaign

* Develop QR code generator app for campaign

* Add deployment script

Add Dockerfile, docker compose, and update Nix config for deployment

* Revert package.json to fix ci

* Revert package-lock.json to ensure ci (Nix build & cache) successful

docker/qrcampaign.Dockerfile

@@ -0,0 +1,17 @@
+FROM node:22-alpine AS deps
+WORKDIR /app
+COPY package.json package-lock.json ./
+RUN npm ci --prefer-offline --no-audit --no-fund
+
+FROM node:22-alpine AS builder
+WORKDIR /app
+COPY --from=deps /app/node_modules ./node_modules
+COPY . .
+ENV NX_DAEMON=false
+RUN npm run qrcampaign:build
+
+FROM nginx:alpine AS runner
+RUN rm -rf /usr/share/nginx/html/*
+COPY --from=builder /app/dist/apps/qrcampaign /usr/share/nginx/html
+EXPOSE 80
+CMD ["nginx", "-g", "daemon off;"]