Ensure that step has a unique id in the dialog

internal/pkg/cli/dialog/steps.go

@@ -49,6 +49,7 @@ func (d *stepsDialog) parse(result string) (input.StepsGroups, map[input.StepInd
 	var currentGroup *input.StepsGroup
 	var currentStep *input.Step
 	stepsToIds := make(map[input.StepIndex]string)
+	usedIds := make(map[string]bool)
 
 	var invalidDefinition bool
 
@@ -89,6 +90,11 @@ func (d *stepsDialog) parse(result string) (input.StepsGroups, map[input.StepInd
 				Step:  len(currentGroup.Steps) - 1,
 				Group: len(stepsGroups) - 1,
 			}
+			if usedIds[m[1]] {
+				errors.Append(fmt.Errorf(`line %d: step with id "%s" is already defined`, lineNum, m[1]))
+				continue
+			}
+			usedIds[m[1]] = true
 			stepsToIds[index] = m[1]
 
 			invalidDefinition = false

internal/pkg/cli/dialog/steps_test.go

@@ -86,6 +86,11 @@ description:
 ## Group
 description:
 
+### Step "s1"
+name: Step One again
+description: Description
+icon: common
+
 ### Step "s2"
 name: Step Two
 description: Description
@@ -99,14 +104,15 @@ description: Description
 	expected := `
 - line 2: there needs to be a group definition before step "s0"
 - line 12: required is not valid option for a step
+- line 21: step with id "s1" is already defined
 - group 1: required must be one of [all atLeastOne exactOne zeroOrOne optional]
 - group 1, step 1: icon is a required field
 - group 1, step 1: name must be a maximum of 20 characters in length
 - group 2: required must be one of [all atLeastOne exactOne zeroOrOne optional]
 - group 2: steps must contain at least 1 step
 - group 3: required must be one of [all atLeastOne exactOne zeroOrOne optional]
-- group 3, step 1: icon is a required field
 - group 3, step 2: icon is a required field
+- group 3, step 3: icon is a required field
 `
 
 	// Parse