Remove CI for the old syn2mas tool

docker-bake.hcl

@@ -4,12 +4,11 @@
 variable "VERGEN_GIT_DESCRIBE" {}
 
 // This is what is baked by GitHub Actions
-group "default" { targets = ["regular", "debug", "syn2mas"] }
+group "default" { targets = ["regular", "debug"] }
 
 // Targets filled by GitHub Actions: one for the regular tag, one for the debug tag
 target "docker-metadata-action" {}
 target "docker-metadata-action-debug" {}
-target "docker-metadata-action-syn2mas" {}
 
 // This sets the platforms and is further extended by GitHub Actions to set the
 // output and the cache locations
@@ -37,8 +36,3 @@ target "debug" {
   inherits = ["base", "docker-metadata-action-debug"]
   target = "debug"
 }
-
-target "syn2mas" {
-  inherits = ["base", "docker-metadata-action-syn2mas"]
-  context = "./tools/syn2mas"
-}