Add Dockerfile, K8s manifests, and deploy.sh for plexnuke k3s cluster

Dockerfile

@@ -0,0 +1,31 @@
+FROM node:20-alpine AS base
+
+FROM base AS deps
+RUN apk add --no-cache libc6-compat
+WORKDIR /app
+COPY package*.json ./
+RUN npm ci
+
+FROM base AS builder
+WORKDIR /app
+COPY --from=deps /app/node_modules ./node_modules
+COPY . .
+ENV NEXT_TELEMETRY_DISABLED=1
+RUN npm run build
+
+FROM base AS runner
+WORKDIR /app
+ENV NODE_ENV=production
+ENV NEXT_TELEMETRY_DISABLED=1
+ENV PORT=3000
+
+RUN addgroup --system --gid 1001 nodejs && adduser --system --uid 1001 nextjs
+
+COPY --from=builder --chown=nextjs:nodejs /app/public ./public
+COPY --from=builder --chown=nextjs:nodejs /app/.next/standalone ./
+COPY --from=builder --chown=nextjs:nodejs /app/.next/static ./.next/static
+
+USER nextjs
+EXPOSE 3000
+
+CMD ["node", "server.js"]