feat: added tkn-tasks sub-command

This new command prints tektons tasks in form of multi-document yaml,
these tekton tasks may requird to be installed for some advanced
functionality.

Signed-off-by: Matej Vašek <mvasek@redhat.com>

cmd/root.go

@@ -107,6 +107,7 @@ Learn more about Knative at: https://knative.dev`, cfg.Name),
 			Commands: []*cobra.Command{
 				NewCompletionCmd(),
 				NewVersionCmd(cfg.Version),
+				NewTektonClusterTasksCmd(),
 			},
 		},
 	}

cmd/tkn_tasks.go

@@ -0,0 +1,27 @@
+package cmd
+
+import (
+	"fmt"
+
+	"github.com/spf13/cobra"
+
+	"knative.dev/func/pkg/pipelines/tekton"
+)
+
+func NewTektonClusterTasksCmd() *cobra.Command {
+	cmd := &cobra.Command{
+		Use:   "tkn-tasks",
+		Short: "List tekton cluster tasks as multi-document yaml",
+		Long: `This command prints tekton tekton task embed in the func binary.
+Some advanced functionality like OpenShift's Web Console build my require installation of these tasks.
+Installation: func tkn-tasks | kubectl apply -f -
+`,
+		Hidden: true,
+		RunE: func(cmd *cobra.Command, args []string) error {
+			_, err := fmt.Fprintln(cmd.OutOrStdout(), tekton.GetClusterTasks())
+			return err
+		},
+	}
+
+	return cmd
+}

pkg/pipelines/tekton/tasks.go

@@ -1,5 +1,7 @@
 package tekton
 
+import "strings"
+
 func getBuildpackTask() string {
 	return `apiVersion: tekton.dev/v1
 kind: Task
@@ -405,3 +407,11 @@ spec:
         deploy $(params.path) "$(params.image)"
 `
 }
+
+// GetClusterTasks returns multi-document yaml containing tekton tasks used by func.
+func GetClusterTasks() string {
+	tasks := getBuildpackTask() + "\n---\n" + getS2ITask() + "\n---\n" + getDeployTask()
+	tasks = strings.Replace(tasks, "kind: Task", "kind: ClusterTask", -1)
+	tasks = strings.ReplaceAll(tasks, "apiVersion: tekton.dev/v1", "apiVersion: tekton.dev/v1beta1")
+	return tasks
+}