Add official image for KrakenD Api Gateway (#13592)

Signed-off-by: Daniel Ortiz <[email protected]>
Co-authored-by: A. Lombarte <[email protected]>

library/krakend

@@ -0,0 +1,9 @@
+Maintainers: Daniel Ortiz <[email protected]> (@taik0),
+             Daniel López <[email protected]> (@kpacha)
+GitRepo: https://github.com/krakendio/docker-library.git
+
+# Alpine images
+Tags: 2.9.3, 2.9, 2, latest
+Architectures: amd64, arm64v8
+GitCommit: bac1c35e5818831f0669176ab140e34705185b55
+Directory: 2.9.3