Fix yaml with prefixed newline broken setjob + yaml v4 (#144)

* go-yaml v3 **and** v4 workaround
* avoid yaml.Marshal broken indention

Co-authored-by: Lunny Xiao <xiaolunwen@gmail.com>
Reviewed-on: https://gitea.com/gitea/act/pulls/144
Reviewed-by: wxiaoguang <wxiaoguang@noreply.gitea.com>
Reviewed-by: Zettat123 <zettat123@noreply.gitea.com>
Co-authored-by: Christopher Homberger <christopher.homberger@web.de>
Co-committed-by: Christopher Homberger <christopher.homberger@web.de>

pkg/jobparser/jobparser_test.go

@@ -8,7 +8,7 @@ import (
 
 	"github.com/stretchr/testify/require"
 
-	"gopkg.in/yaml.v3"
+	"go.yaml.in/yaml/v4"
 )
 
 func TestParse(t *testing.T) {
@@ -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) {