feat: add milestone set check

plugins/auto_merge/checks/has_milestone.go

@@ -0,0 +1,25 @@
+package checks
+
+import (
+	"github.com/GEPROG/lassie-bot-dog/plugins/auto_merge/config"
+	"github.com/xanzy/go-gitlab"
+)
+
+type HasMilestone struct {
+}
+
+func (check HasMilestone) Check(_ *config.AutoMergeConfig, _ *gitlab.Project, mergeRequest *gitlab.MergeRequest) bool {
+	return mergeRequest.Milestone != nil
+}
+
+func (check HasMilestone) Name() string {
+	return "has-milestone"
+}
+
+func (check HasMilestone) PassedText(_ int) string {
+	return "Your Merge-Request has a milestone assigned"
+}
+
+func (check HasMilestone) FailedText(_ int) string {
+	return "Your Merge-Request has no milestone assigned"
+}

plugins/auto_merge/merge_checks.go

@@ -71,6 +71,7 @@ func (plugin AutoMergePlugin) setupMergeChecks() {
 		checks.HasNoOpenDiscussionsCheck{Client: plugin.Client},
 		checks.IsNotWorkInProgressCheck{},
 		checks.HasAssignee{},
+		checks.HasMilestone{},
 		checks.PassesCICheck{
 			Client: plugin.Client,
 		},