Fix yaml with prefixed newline broken setjob

pkg/jobparser/jobparser_test.go

@@ -52,6 +52,11 @@ func TestParse(t *testing.T) {
 			options: nil,
 			wantErr: false,
 		},
+		{
+			name:    "prefixed_newline",
+			options: nil,
+			wantErr: false,
+		},
 	}
 	for _, tt := range tests {
 		t.Run(tt.name, func(t *testing.T) {

pkg/jobparser/model.go

@@ -50,16 +50,18 @@ func (w *SingleWorkflow) SetJob(id string, job *Job) error {
 	m := map[string]*Job{
 		id: job,
 	}
-	out, err := yaml.Marshal(m)
-	if err != nil {
-		return err
-	}
+	var buf bytes.Buffer
+	encoder := yaml.NewEncoder(&buf)
+	encoder.SetIndent(2)
+	encoder.Encode(m)
+	encoder.Close()
+
 	node := yaml.Node{}
-	if err := yaml.Unmarshal(out, &node); err != nil {
+	if err := yaml.Unmarshal(buf.Bytes(), &node); err != nil {
 		return err
 	}
 	if len(node.Content) != 1 || node.Content[0].Kind != yaml.MappingNode {
-		return fmt.Errorf("can not set job: %q", out)
+		return fmt.Errorf("can not set job: %s", buf.String())
 	}
 	w.RawJobs = *node.Content[0]
 	return nil

pkg/jobparser/testdata/prefixed_newline.in.yaml

@@ -0,0 +1,14 @@
+name: Step with leading new line
+
+on:
+  push:
+
+jobs:
+  test:
+    runs-on: ubuntu-latest
+    steps:
+      - name: "\nExtract tag for variant"
+        id: extract_tag
+        run: |
+
+          echo Test

pkg/jobparser/testdata/prefixed_newline.out.yaml

@@ -0,0 +1,15 @@
+name: Step with leading new line
+"on":
+  push:
+jobs:
+  test:
+    name: test
+    runs-on: ubuntu-latest
+    steps:
+      - id: extract_tag
+        name: |2-
+
+          Extract tag for variant
+        run: |2
+
+          echo Test