devapp: place stars next to release-blocking issues

It was previously like this:
https://web.archive.org/web/20140622000427/http://research.swtch.com/dashboard/Go1.4#all

Change-Id: I617da68cace784e072b2daa7bc952c170410e78a
Reviewed-on: https://go-review.googlesource.com/79475
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>

devapp/release.go

@@ -84,6 +84,13 @@ type item struct {
 	CLs   []*gerritCL
 }
 
+func (i *item) ReleaseBlocker() bool {
+	if i.Issue == nil {
+		return false
+	}
+	return i.Issue.HasLabel("release-blocker")
+}
+
 type itemsBySummary []item
 
 func (x itemsBySummary) Len() int           { return len(x) }

devapp/templates/release.tmpl

@@ -34,6 +34,10 @@ a:visited {
 .Item {
   display: flex;
 }
+.Item-blocker:before {
+  content: '★';
+  position: absolute;
+}
 .Item-num {
   margin-left: 4ch;
   min-width: 12ch;
@@ -60,7 +64,7 @@ a:visited {
       {{range .Items}}
         {{$i := .Issue}}
         {{if $i}}
-          <div class="Item">
+          <div class="Item{{if .ReleaseBlocker}} Item-blocker{{end}}">
             <a class="Item-num" href="https://golang.org/issue/{{.Issue.Number}}" target="_blank">#{{.Issue.Number}}</a>
             <span class="Item-title">{{.Issue.Title}}</span>
           </div>