fix: run db:migrate at container startup instead of build time

Migration now runs at container start (when DB is available) rather than
during the build stage (when no DB is reachable). The release image now
includes node_modules, drizzle.config.ts, and the drizzle/ folder so
drizzle-kit can apply pending migrations on each deploy.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Dockerfile

@@ -16,7 +16,7 @@ ENV NODE_ENV=production \
     BETTER_AUTH_URL=http://localhost:3000 \
     AUTH_SECRET=docker-build-placeholder-secret-do-not-use \
     DATABASE_URL=postgres://postgres:postgres@localhost:5432/postgres
-RUN bun run build && bun build src/server/db/migrate.ts --target=bun --outfile=migrate.js
+RUN bun run build
 
 FROM base AS release
 ENV NODE_ENV=production \
@@ -26,11 +26,13 @@ ENV NODE_ENV=production \
 COPY --from=build /usr/src/app/.next/standalone ./
 COPY --from=build /usr/src/app/.next/static ./.next/static
 COPY --from=build /usr/src/app/public ./public
-COPY --from=build /usr/src/app/migrate.js ./migrate.js
+COPY --from=install /usr/src/app/node_modules node_modules
+COPY --from=build /usr/src/app/package.json ./package.json
+COPY --from=build /usr/src/app/drizzle.config.ts ./drizzle.config.ts
 COPY --from=build /usr/src/app/drizzle ./drizzle
 
-RUN chmod -R a+rX drizzle migrate.js public
+RUN chmod -R a+rX drizzle public
 
 USER bun
 EXPOSE 3000
-CMD ["sh", "-c", "bun migrate.js && bun server.js"]
+CMD ["sh", "-c", "bun run db:migrate && bun server.js"]