[Swift] Add Swift 4.2.4 release Dockerfile

library/swift

@@ -15,7 +15,11 @@ Tags: 5.0-xenial, xenial
 GitCommit: 0d3ffbb7885c8731970fc294be96ce91153840d9
 Directory: 5.0/ubuntu/16.04
 
-Tags: 4.2.3, 4.2, 4
+Tags: 4.2.4, 4.2, 4
+GitCommit: f0a61df2dd9a14dd6988e6017ae58cc63df37f41
+Directory: 4.2/ubuntu/16.04
+
+Tags: 4.2.3
 GitCommit: 75dde01ef86e98437b1206c6a58d0428dfb345a4
 Directory: 4.2/ubuntu/16.04