I need some help regarding publishing the ASP.NET Core Web APIs to the gitlab docker production environment. I have inherited the code from another team, and the current APIs are working fine on production, even if I make changes on them and re-publish it again.

However, when I add another controller, it works well in the local environment, but fails to load in the production environment.

I have set the following in launchsettings.json:

  "environmentVariables": {
      "ASPNETCORE_ENVIRONMENT": "Production"
  }

I added a default out-of-the-box controller and it works locally, but I get an http 404 error in the production environment.

using Microsoft.AspNetCore.Mvc;

// For more information on enabling Web API for empty projects, visit https://go.microsoft.com/fwlink/?LinkID=397860

namespace testweb.default
{
    [Route("api/[controller]")]
    [ApiController]
    public class ValuesController : ControllerBase
    {
        // GET: api/<ValuesController>
        [HttpGet]
        public IEnumerable<string> Get()
        {
            return new string[] { "value1", "value2" };
        }

        // GET api/<ValuesController>/5
        [HttpGet("{id}")]
        public string Get(int id)
        {
            return "value";
        }

        // POST api/<ValuesController>
        [HttpPost]
        public void Post([FromBody] string value)
        {
        }

        // PUT api/<ValuesController>/5
        [HttpPut("{id}")]
        public void Put(int id, [FromBody] string value)
        {
        }

        // DELETE api/<ValuesController>/5
        [HttpDelete("{id}")]
        public void Delete(int id)
        {
        }
    }
}

Here is my .gitlab-ci.yml file

variables:
  DOCKER_IMAGE_PRODUCTION : $CI_REGISTRY_IMAGE 
  DOCKER_IMAGE_TEST       : $CI_REGISTRY_IMAGE 
  DOCKER_IMAGE_DEV        : $CI_REGISTRY_IMAGE

stages :
  - push_registry_dev
  - update_manifests_dev
  - push_registry_test
  - update_manifests_test
  - push_registry_uat
  - update_manifests_uat

  
build_image_dev:
  stage: push_registry_dev
  image : mcr.microsoft.com/dotnet/sdk:8.0
  services:
    - docker:24.0.6-dind
  variables: 
    DOCKER_HOST: tcp://docker:2375/
    DOCKER_DRIVER: overlay2
    DOCKER_TLS_CERTDIR: ""
  before_script:
    - cat /etc/os-release
    - curl -sSL https://get.docker.com/ | sh
    - echo -n $CI_JOB_TOKEN | docker login -u gitlab-ci-token --password-stdin $CI_REGISTRY
    - export PATH="$PATH:/root/.dotnet/tools"
    - dotnet tool install --global dotnet-ef
  script:
    # - cat .env.development > .env
    # - docker build  -f dev.Dockerfile --tag $DOCKER_IMAGE_TEST:$CI_COMMIT_SHORT_SHA-dev .
    #- dotnet ef database update --project TestProject.Infrastructure/ --startup-project TestProject.Web/ --connection "Server=***.***.***.***;Initial Catalog=db;User Id=sa;Password=*******;TrustServerCertificate=true"
    - cd ./TestProject.Web
    - dotnet publish --os linux --arch x64 -p:PublishProfile=DefaultContainer -p:ContainerImageName=test-backend
    - docker tag test-backend $DOCKER_IMAGE_TEST:$CI_COMMIT_SHORT_SHA-dev
    - docker push $DOCKER_IMAGE_TEST:$CI_COMMIT_SHORT_SHA-dev

  only:
    - develop
    - main
    - prod
  tags :
    - gitlab-org-docker
 


update_manifest_dev:
  stage: update_manifests_dev
  variables:
    GIT_STRATEGY: none
  retry: 2
  image: docker:24.0.6
  services:
    - docker:24.0.6-dind
  script:
    # Add SSH key to root
    - mkdir -p /root/.ssh
    - cat "${GIT_SSH}" > /root/.ssh/id_rsa
    - ssh-keyscan -H gitlab.com > /root/.ssh/known_hosts
    - chmod 400 /root/.ssh/id_rsa
    - apk add --no-cache git 
    - export GIT_SSH_COMMAND="ssh -i ~/.ssh/id_rsa"
    - git config --global user.name "username"
    - git config --global user.email "[email protected]"
    - git clone --single-branch --branch main [email protected]:company/k8s-manifests.git
    - cd k8s-manifests/test/dev/api
    - export REPO=$DOCKER_IMAGE_DEV:$CI_COMMIT_SHORT_SHA-dev
    - chmod -R 777 ${PWD}
    - docker run --rm -v ${PWD}:/workdir -e REPO=$REPO mikefarah/yq:4.12.2  e '.spec.template.spec.containers[0].image=env(REPO)' --inplace deployment.yml
    - git commit -am "New version updated ${CI_COMMIT_SHORT_SHA}-dev" && git push origin main
  tags: 
    - gitlab-org-docker
  needs: ["build_image_dev"]
  only:
    refs:
    - develop
    - main
    - prod

Is there anything else I need to change in the code? I am not that conversant with docker technologies.