Add _redirects to Dockerfile

Author: brookslybrand

Dockerfile

@@ -40,6 +40,7 @@ COPY --chown=node:node --from=production-deps /remixapp/node_modules /remixapp/n
 COPY --chown=node:node --from=build /remixapp/build /remixapp/build
 COPY --chown=node:node --from=build /remixapp/server.ts /remixapp/server.ts
 COPY --chown=node:node --from=build /remixapp/server /remixapp/server
+COPY --chown=node:node --from=build /remixapp/_redirects /remixapp/_redirects
 COPY --chown=node:node --from=build /remixapp/shared /remixapp/shared
 COPY --chown=node:node --from=build /remixapp/data /remixapp/data
 COPY --chown=node:node --from=build /remixapp/package.json /remixapp/package.json