Sort the ecosystems list for presentation in the UI

In the page footer and the 'select' list on the packages page, the
list of ecosystems should be sorted in a predictable order.

Author: kpfleming

internal/server/dashboard.go

@@ -114,22 +114,25 @@ type PackagesListPageData struct {
 }
 
 func supportedEcosystems() []string {
+	// this list should be kept sorted in lexicographic order so
+	// that the 'select' list in the UI will be in the expected
+	// order
 	return []string{
-		"npm",
 		"cargo",
+		"composer",
+		"conan",
+		"conda",
+		"cran",
+		"deb",
 		"gem",
 		"golang",
 		"hex",
-		"pub",
-		"pypi",
 		"maven",
+		"npm",
 		"nuget",
-		"composer",
-		"conan",
-		"conda",
-		"cran",
 		"oci",
-		"deb",
+		"pub",
+		"pypi",
 		"rpm",
 	}
 }