Fix `status_check_contexts` matching bug (#28582)

Fix #28570
Follow #24633

---
Copied from
https://github.com/go-gitea/gitea/issues/28570#issuecomment-1867327999

The feature introduced in #24633 should be compatible with
`status_check_contexts`. However, if one or more of
`status_check_contexts` is not a legal glob expressions, `glob.Compile`
will fail and the contexts cannot match.


21229ed2c8/routers/web/repo/pull.go (L653-L663)

routers/web/repo/pull.go

@@ -653,7 +653,15 @@ func PrepareViewPullInfo(ctx *context.Context, issue *issues_model.Issue) *git.C
 	if pb != nil && pb.EnableStatusCheck {
 		ctx.Data["is_context_required"] = func(context string) bool {
 			for _, c := range pb.StatusCheckContexts {
-				if gp, err := glob.Compile(c); err == nil && gp.Match(context) {
+				if c == context {
+					return true
+				}
+				if gp, err := glob.Compile(c); err != nil {
+					// All newly created status_check_contexts are checked to ensure they are valid glob expressions before being stored in the database.
+					// But some old status_check_context created before glob was introduced may be invalid glob expressions.
+					// So log the error here for debugging.
+					log.Error("compile glob %q: %v", c, err)
+				} else if gp.Match(context) {
 					return true
 				}
 			}