feat: add check validity to the user signup

apps/edr-freight-api/src/modules/auth/check-availability.controller.ts

@@ -0,0 +1,22 @@
+import { Controller, Get, Query } from "@nestjs/common";
+import { ApiOperation, ApiTags } from "@nestjs/swagger";
+import { Public } from "@edr/api-common";
+
+import { CheckAvailabilityService } from "./check-availability.service";
+
+@ApiTags("auth")
+@Controller("auth")
+@Public()
+export class CheckAvailabilityController {
+  constructor(
+    private readonly checkAvailabilityService: CheckAvailabilityService,
+  ) {}
+
+  @Get("check-availability")
+  @ApiOperation({
+    summary: "Check whether an email and/or phone number is already registered",
+  })
+  check(@Query("email") email?: string, @Query("phone") phone?: string) {
+    return this.checkAvailabilityService.check({ email, phone });
+  }
+}