Consider updating your Docker base image

[carlosjgp]

Your Docker image is using Alpine 3.5 which official support ended 2018-11-01
https://en.wikipedia.org/wiki/Alpine_Linux

Since you are using GoLang you could use
Google's distroless gcr.io/distroless/base
https://github.com/GoogleContainerTools/distroless/tree/master/base

And never worry again about underlying OS getting outdated.
Alternatively use Alpine 3.11 which is the latest distribution

Thanks for this work!