ci(admin-web): Docker build & push vers registry Gitea + reusable tests

- Nouveau Dockerfile multi-stage Next.js standalone (node:22-bookworm-slim)
- Configuration semantic-release (.releaserc.json, version.json, devDeps)
- docker-compose.portainer.yml pour déploiement Portainer
- Workflow docker-admin-web.yml : test → semantic-release → build push → deploy
- Extraction admin-web-tests.yml (reusable workflow) appelé par ci.yml et docker-admin-web.yml → 0 duplication
- next.config.ts : ajout output: 'standalone'
- .dockerignore : exclusions node_modules, .next, etc.

admin-web/Dockerfile

@@ -0,0 +1,29 @@
+FROM node:22-bookworm-slim AS build
+
+WORKDIR /app
+
+COPY package.json package-lock.json ./
+
+RUN npm ci
+
+COPY . .
+
+RUN npm run build
+
+FROM node:22-bookworm-slim AS production
+
+WORKDIR /app
+
+ENV NODE_ENV=production
+
+COPY --from=build /app/public ./public
+COPY --from=build /app/.next/standalone ./
+COPY --from=build /app/.next/static ./.next/static
+
+RUN groupadd -g 1001 appgroup && useradd -u 1001 -g appgroup -s /bin/sh -M nodeuser
+
+USER nodeuser
+
+EXPOSE 3000
+
+ENTRYPOINT ["node", "server.js"]