add nixpack file

Dockerfile

@@ -0,0 +1,13 @@
+# Build stage
+FROM node:20-alpine AS builder
+WORKDIR /app
+COPY package*.json ./
+RUN npm ci
+COPY . .
+RUN node --max-old-space-size=2048 ./node_modules/.bin/ng build --configuration production
+
+# Serve stage
+FROM nginx:alpine
+COPY --from=builder /app/dist/test /usr/share/nginx/html
+EXPOSE 80
+CMD ["nginx", "-g", "daemon off;"]

nixpacks.toml

@@ -0,0 +1,11 @@
+[phases.setup]
+nixPkgs = ["nodejs_20"]
+
+[phases.install]
+cmds = ["npm ci"]
+
+[phases.build]
+cmds = ["node --max-old-space-size=2048 ./node_modules/.bin/ng build --configuration production"]
+
+[start]
+cmd = "npx --yes serve -s dist/test/browser -l 3000"