feat: healthcheck for external services (#4048)

* chore: installed terminus package and scaffolded the health module

* feat: added healthcheck for database with prisma

* chore: renamed label from prisma to database in health check route

* chore: reverted target of hopp-old-backend service to prod

packages/hoppscotch-backend/src/health/health.controller.ts

@@ -0,0 +1,24 @@
+import { Controller, Get } from '@nestjs/common';
+import {
+  HealthCheck,
+  HealthCheckService,
+  PrismaHealthIndicator,
+} from '@nestjs/terminus';
+import { PrismaService } from 'src/prisma/prisma.service';
+
+@Controller('health')
+export class HealthController {
+  constructor(
+    private health: HealthCheckService,
+    private prismaHealth: PrismaHealthIndicator,
+    private prisma: PrismaService,
+  ) {}
+
+  @Get()
+  @HealthCheck()
+  check() {
+    return this.health.check([
+      async () => this.prismaHealth.pingCheck('database', this.prisma),
+    ]);
+  }
+}

packages/hoppscotch-backend/src/health/health.module.ts

@@ -0,0 +1,10 @@
+import { Module } from '@nestjs/common';
+import { HealthController } from './health.controller';
+import { PrismaModule } from 'src/prisma/prisma.module';
+import { TerminusModule } from '@nestjs/terminus';
+
+@Module({
+  imports: [PrismaModule, TerminusModule],
+  controllers: [HealthController],
+})
+export class HealthModule {}