fix: only show platforms in summary when known

src/report/annotation.go

@@ -36,7 +36,8 @@ func (c AnnotationContext) Render() ([]byte, error) {
 	t, err := template.
 		New("annotation").
 		Funcs(template.FuncMap{
-			"hasUntilValue": hasUntilValue,
+			"hasKnownPlatform": hasKnownPlatform,
+			"hasUntilValue":    hasUntilValue,
 			"titleCase": func(s string) string {
 				c := cases.Title(language.English)
 				return c.String(s)
@@ -199,3 +200,12 @@ func joinPlatforms(input []v1.Platform) string {
 	}
 	return strings.Join(platformValues, ", ")
 }
+
+func hasKnownPlatform(input []v1.Platform) bool {
+	for _, v := range input {
+		if v.OS != "unknown" {
+			return true
+		}
+	}
+	return false
+}

src/report/annotation.gohtml

@@ -14,9 +14,9 @@ be wrapped in <p> tag by the Markdown renderer in Buildkite.
 {{ $summary := .FindingSummary }}
 {{ if .ImageLabel }}
 <h4>Vulnerability summary for "{{ .ImageLabel }}"</h4>
-<p class="h6 regular italic">{{ .Image.DisplayName }}{{ if $summary.Platforms }} with platform{{ if gt (len $summary.Platforms) 1 }}s{{ end }} {{ joinPlatforms $summary.Platforms }}{{ end }}</p>
+<p class="h6 regular italic">{{ .Image.DisplayName }}{{ if (and $summary.Platforms (hasKnownPlatform $summary.Platforms)) }} with platform{{ if gt (len $summary.Platforms) 1 }}s{{ end }} {{ joinPlatforms $summary.Platforms }}{{ end }}</p>
 {{ else }}
-<h4>Vulnerability summary for "{{ .Image.DisplayName }}"</h4>{{ if $summary.Platforms }}
+<h4>Vulnerability summary for "{{ .Image.DisplayName }}"</h4>{{ if (and $summary.Platforms (hasKnownPlatform $summary.Platforms)) }}
 <p class="h6 regular italic">Platform{{ if gt (len $summary.Platforms) 1 }}s{{ end }}: {{ joinPlatforms $summary.Platforms }}</p>{{ end }}
 {{ end }}
 {{ if .FindingSummary.Counts }}