无法触发我的默认（主）分支的管道

Question

我一直在绕这个大脑，我觉得自己无处可去。我有一个项目，其代码托管在gitlab上。我的项目有两个分支，开发和main。我对开发分支进行更改，推动这些更改我的登台实例的更改。当我准备部署实时更改时，我将与main合并，这旨在触发我的实例部署。这是我的gitlab-ci.yml文件，

default:
  image: docker:19.03.10
  tags:
    - docker
    
.deployment_script: &deployment_script
  - echo "Starting deployment to ECS ..."
  - echo "So many lines here that deploy code to aws ecs"

services:
  - docker:dind

variables:
  REPOSITORY_URL: **********.dkr.ecr.**-****-*.amazonaws.com/********/****

before_script:
  - echo "Creating image tag ..."
  - IMAGE_TAG="$(echo $CI_COMMIT_SHA | head -c 8)"

stages:
  - build
  - deploy

build:
  stage: build
  script:
    - echo $DEPLOY_ENVIRONMENT ...
    - echo "The script here build my docker container and publishes to aws ecr"
    - echo "Build is only meant to be ran when pushing to develop"
  rules:
    - if: '$CI_COMMIT_BRANCH == "develop"'
      when: always        

deploy-staging:
  environment: staging
  dependencies:
    - "build"
  image: registry.gitlab.com/gitlab-org/cloud-deploy/aws-base:latest
  script:
    - *deployment_script
  rules:
    - if: '$CI_COMMIT_BRANCH == "develop"'
      when: manual

deploy-production:
  environment: production
  image: registry.gitlab.com/gitlab-org/cloud-deploy/aws-base:latest
  script:
    - *deployment_script
  rules:
    - if: '$CI_COMMIT_BRANCH == "main"'
      when: manual

每次我部署到开发分支时，都会触发管道，我成功地部署了我的登台应用程序。但是，无论我推了多少次main，都没有触发。我不知道为什么。我希望有人也能指出正确的方向。