Slim down docker image size

[ericbottard]

Currently, the invoker image is built FROM golang:x, as attempts to use slimmer images (like alpine) failed due to go-plugin specific issues. Investigate

[dturanski]

I did some investigation. Tried building invoker as a statically linked executable (and the function with and without static linking) to run on alpine. e.g. CGO_ENABLED=0 go build -a -o /riff-entrypoint cmd/${COMPONENT}.go Ran into this golang/go#19569. Same result plugin: not implemented.