fix: multiple extra-files are not evaluated properly (#61)

Quoting issues caused multiple extra-files to be ignored.

cmd/rp/cmd/run_test.go

@@ -0,0 +1,59 @@
+package cmd
+
+import (
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+)
+
+func Test_parseExtraFiles(t *testing.T) {
+	tests := []struct {
+		name  string
+		input string
+		want  []string
+	}{
+		{
+			name:  "empty",
+			input: ``,
+			want:  []string{},
+		},
+		{
+			name:  "empty quoted",
+			input: `""`,
+			want:  []string{},
+		},
+		{
+			name:  "single",
+			input: `foo.txt`,
+			want:  []string{"foo.txt"},
+		},
+		{
+			name:  "single quoted",
+			input: `"foo.txt"`,
+			want:  []string{"foo.txt"},
+		},
+		{
+			name: "multiple",
+			input: `foo.txt
+dir/Chart.yaml`,
+			want: []string{"foo.txt", "dir/Chart.yaml"},
+		},
+		{
+			name: "multiple quoted",
+			input: `"foo.txt
+dir/Chart.yaml"`,
+			want: []string{"foo.txt", "dir/Chart.yaml"},
+		},
+		{
+			name:  "multiple with broken new lines",
+			input: `"action.yml\ntemplates/run.yml\n"`,
+			want:  []string{"action.yml", "templates/run.yml"},
+		},
+	}
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			got := parseExtraFiles(tt.input)
+			assert.Equal(t, tt.want, got)
+		})
+	}
+}