Add `missing-data` demo

demos/main.go

@@ -15,6 +15,8 @@ func main() {
 	d.Add(reportMostPopularDockerImages(), "demo-mostPopularDockerImages", "")
 	d.Add(reportMostPopularPackageManagers(), "demo-mostPopularPackageManagers", "")
 
+	d.Add(generateMissingData(), "demo-generateMissingData", "")
+
 	d.Add(generateAdvisoryAndList(), "demo-generateAdvisoryAndList", "")
 	d.Add(reportAdvisories(), "demo-reportAdvisories", "")
 	d.Add(reportLicenses(), "demo-reportLicenses", "")
@@ -184,6 +186,19 @@ func setOwners() *demo.Run {
 	return r
 }
 
+func generateMissingData() *demo.Run {
+	r := demo.NewRun(
+		"Generate missing package data",
+		"Via https://osv.dev",
+	)
+
+	r.Step(nil, demo.S(
+		"dmd db generate missing-data --db dmd.db",
+	))
+
+	return r
+}
+
 func generateAdvisoryAndList() *demo.Run {
 	r := demo.NewRun(
 		"Seed the database with known package advisories",