Added Fargate related jobs

Extended Deploy/ECS template.
Added rspecs accordingly.
Updated documentation.

changelogs/unreleased/218841-extend-ecs-for-fargate.yml

+---
+title: Extend ECS Deploy template with Fargate jobs
+merge_request: 35173
+author:
+type: added

doc/topics/autodevops/requirements.md

@@ -112,9 +112,9 @@ Variable. To do so, follow these steps:
    section.
 
 1. Specify which AWS platform to target during the Auto DevOps deployment
-   by adding the `AUTO_DEVOPS_PLATFORM_TARGET` variable.
-
-1. Give this variable the value `ECS` before saving it.
+   by adding the `AUTO_DEVOPS_PLATFORM_TARGET` variable with one of the following values:
+   - `FARGATE` if the service you're targeting must be of launch type FARGATE.
+   - `ECS` if you're not enforcing any launch type check when deploying to ECS.
 
 When you trigger a pipeline, if Auto DevOps is enabled and if you've correctly
 [entered AWS credentials as environment variables](../../ci/cloud_deployment/index.md#deploy-your-application-to-the-aws-elastic-container-service-ecs),

lib/gitlab/ci/templates/Jobs/Deploy/ECS.gitlab-ci.yml

@@ -13,11 +13,20 @@
   script:
     - ecs update-task-definition
 
-review_ecs:
-  extends: .deploy_to_ecs
+.review_ecs_base:
   stage: review
+  extends: .deploy_to_ecs
   environment:
     name: review/$CI_COMMIT_REF_NAME
+
+.production_ecs_base:
+  stage: production
+  extends: .deploy_to_ecs
+  environment:
+    name: production
+
+review_ecs:
+  extends: .review_ecs_base
   rules:
     - if: '$AUTO_DEVOPS_PLATFORM_TARGET != "ECS"'
       when: never
@@ -29,11 +38,21 @@ review_ecs:
       when: never
     - if: '$CI_COMMIT_TAG || $CI_COMMIT_BRANCH'
 
+review_fargate:
+  extends: .review_ecs_base
+  rules:
+    - if: '$AUTO_DEVOPS_PLATFORM_TARGET != "FARGATE"'
+      when: never
+    - if: '$CI_KUBERNETES_ACTIVE'
+      when: never
+    - if: '$REVIEW_DISABLED'
+      when: never
+    - if: '$CI_COMMIT_BRANCH == "master"'
+      when: never
+    - if: '$CI_COMMIT_TAG || $CI_COMMIT_BRANCH'
+
 production_ecs:
-  extends: .deploy_to_ecs
-  stage: production
-  environment:
-    name: production
+  extends: .production_ecs_base
   rules:
     - if: '$AUTO_DEVOPS_PLATFORM_TARGET != "ECS"'
       when: never
@@ -42,3 +61,14 @@ production_ecs:
     - if: '$CI_COMMIT_BRANCH != "master"'
       when: never
     - if: '$CI_COMMIT_TAG || $CI_COMMIT_BRANCH'
+
+production_fargate:
+  extends: .production_ecs_base
+  rules:
+    - if: '$AUTO_DEVOPS_PLATFORM_TARGET != "FARGATE"'
+      when: never
+    - if: '$CI_KUBERNETES_ACTIVE'
+      when: never
+    - if: '$CI_COMMIT_BRANCH != "master"'
+      when: never
+    - if: '$CI_COMMIT_TAG || $CI_COMMIT_BRANCH'

spec/lib/gitlab/ci/templates/auto_devops_gitlab_ci_yaml_spec.rb

@@ -37,6 +37,7 @@ RSpec.describe 'Auto-DevOps.gitlab-ci.yml' do
 
     context 'when the project is set for deployment to AWS' do
       let(:platform_value) { 'ECS' }
+      let(:review_prod_build_names) { build_names.select {|n| n.include?('review') || n.include?('production')} }
 
       before do
         create(:ci_variable, project: project, key: 'AUTO_DEVOPS_PLATFORM_TARGET', value: platform_value)
@@ -67,8 +68,15 @@ RSpec.describe 'Auto-DevOps.gitlab-ci.yml' do
       end
 
       it 'creates an ECS deployment job for production only' do
-        expect(build_names).not_to include('review_ecs')
-        expect(build_names).to include('production_ecs')
+        expect(review_prod_build_names).to contain_exactly('production_ecs')
+      end
+
+      context 'with FARGATE as a launch type' do
+        let(:platform_value) { 'FARGATE' }
+
+        it 'creates a FARGATE deployment job for production only' do
+          expect(review_prod_build_names).to contain_exactly('production_fargate')
+        end
       end
 
       context 'and we are not on the default branch' do
@@ -79,15 +87,22 @@ RSpec.describe 'Auto-DevOps.gitlab-ci.yml' do
           project.repository.create_branch(pipeline_branch)
         end
 
+        %w(review_ecs review_fargate).each do |job|
           it_behaves_like 'no ECS job when AUTO_DEVOPS_PLATFORM_TARGET is not present' do
-          let(:job_name) { 'review_ecs' }
+            let(:job_name) { job }
+          end
         end
 
         it 'creates an ECS deployment job for review only' do
-          expect(build_names).to include('review_ecs')
-          expect(build_names).not_to include('production_ecs')
-          expect(build_names).not_to include('review')
-          expect(build_names).not_to include('production')
+          expect(review_prod_build_names).to contain_exactly('review_ecs')
+        end
+
+        context 'with FARGATE as a launch type' do
+          let(:platform_value) { 'FARGATE' }
+
+          it 'creates an FARGATE deployment job for review only' do
+            expect(review_prod_build_names).to contain_exactly('review_fargate')
+          end
         end
       end