Dockerfile: Run go install with -ldflags '-s -w'
Dockerfile: Run go install with -ldflags '-s -w'

This reduce the Docker image size from 27 MB to 20.5 MB.

fedelibre/hugo,mdhender/hugo,fedelibre/hugo,mdhender/hugo,mdhender/hugo,anthonyfok/hugo,anthonyfok/hugo,gohugoio/hugo,gohugoio/hugo,fedelibre/hugo,anthonyfok/hugo,gohugoio/hugo,fedelibre/hugo,mdhender/hugo