Restore docker deployment pipeline

Adapt the Dockerfile to work with Nuxt and restore the deployment
pipeline.

Dockerfile

@@ -0,0 +1,37 @@
+# syntax=docker.io/docker/dockerfile:1
+# Based on Next.js's docker image example
+FROM node:22 AS base
+
+# Install dependencies only when needed
+FROM base AS deps
+WORKDIR /app
+
+COPY package.json pnpm-lock.yaml* ./
+RUN corepack enable pnpm && pnpm i --frozen-lockfile
+
+# Rebuild the source code only when needed
+FROM base AS builder
+WORKDIR /app
+COPY --from=deps /app/node_modules ./node_modules
+COPY . .
+
+RUN corepack enable pnpm && pnpm run build
+
+# Production image, copy all the files and run next
+FROM base AS runner
+WORKDIR /app
+
+ENV NODE_ENV=production
+
+COPY --from=builder /app/.output ./
+COPY --chown=node:node schedule.json .
+RUN echo '[]' > push-subscriptions.json && chown node:node push-subscriptions.json
+
+USER node
+
+EXPOSE 3000
+
+ENV PORT=3000
+ENV HOST="0.0.0.0"
+
+CMD ["node", "server/index.mjs"]