Supporting exporting GitLab CI piplelines

Author: ZhuGongpu

internal/cmdexport/cmdexport.go

@@ -55,6 +55,10 @@ func GetExportRunner() *ExportRunner {
 				{
 					r.Pipeline = new(orchestrators.CloudBuild)
 				}
+			case "gitlab-ci":
+				{
+					r.Pipeline = new(orchestrators.GitLabCI)
+				}
 			default:
 				return fmt.Errorf("unsupported orchestrator %v", r.Orchestrator)
 			}

internal/cmdexport/cmdexport_test.go

@@ -176,6 +176,32 @@ steps:
       - .
       - --fn-path
       - functions
+`,
+	},
+	{
+		description: "exports a GitLab CI pipeline with --fn-path",
+		files: map[string]string{
+			"resources/resource.yaml": "",
+			"functions/function.yaml": "",
+		},
+		params: []string{
+			"gitlab-ci",
+			"resources",
+			"--fn-path",
+			"functions",
+			"--output",
+			".gitlab-ci.yml",
+		},
+		expected: `
+stages:
+  - run-kpt-functions
+kpt:
+    stage: run-kpt-functions
+    image: docker
+    services:
+      - docker:dind
+    script: docker run -v $PWD:/app -v /var/run/docker.sock:/var/run/docker.sock gongpu/kpt:latest
+        fn run /app/resources --fn-path /app/functions
 `,
 	},
 }

internal/docs/generated/fndocs/docs.go

@@ -31,7 +31,7 @@ kpt fn export github-actions DIR/ --fn-path FUNCTIONS_DIR/
 kpt fn export ORCHESTRATOR DIR/ [--fn-path FUNCTIONS_DIR/] [--output OUTPUT_FILENAME]
 
 ORCHESTRATOR:
-  Supported orchestrators are github-actions, and cloud-build.
+  Supported orchestrators are github-actions, cloud-build, and gitlab-ci.
 DIR:
   Path to a package directory. If you do not specify the --fn-path flag, this command will discover functions in DIR and run them against resources in it.
 ```