mod-outdated target to check for outdated dependencies

Signed-off-by: CrazyMax <crazy-max@users.noreply.github.com>

docker-bake.hcl

@@ -35,6 +35,17 @@ target "update-vendor" {
   output = ["."]
 }
 
+target "mod-outdated" {
+  dockerfile = "./dockerfiles/vendor.Dockerfile"
+  target = "outdated"
+  args = {
+    // used to invalidate cache for outdated run stage
+    // can be dropped when https://github.com/moby/buildkit/issues/1213 fixed
+    _RANDOM = uuidv4()
+  }
+  output = ["type=cacheonly"]
+}
+
 target "binary" {
   inherits = ["_common"]
   target = "binary"