update to latest version of action parser

vendor/github.com/actions/workflow-parser/model/command.go

@@ -0,0 +1,38 @@
+package model
+
+import (
+	"strings"
+)
+
+// Command represents the optional "runs" and "args" attributes.
+// Each one takes one of two forms:
+//   - runs="entrypoint arg1 arg2 ..."
+//   - runs=[ "entrypoint", "arg1", "arg2", ... ]
+type Command interface {
+	isCommand()
+	Split() []string
+}
+
+// StringCommand represents the string based form of the "runs" or "args"
+// attribute.
+//   - runs="entrypoint arg1 arg2 ..."
+type StringCommand struct {
+	Value string
+}
+
+// ListCommand represents the list based form of the "runs" or "args" attribute.
+//   - runs=[ "entrypoint", "arg1", "arg2", ... ]
+type ListCommand struct {
+	Values []string
+}
+
+func (s *StringCommand) isCommand() {}
+func (l *ListCommand) isCommand()   {}
+
+func (s *StringCommand) Split() []string {
+	return strings.Fields(s.Value)
+}
+
+func (l *ListCommand) Split() []string {
+	return l.Values
+}