Disable the Go GC

For the most part we run for a few milliseconds and quit, there's
no need to do any GC in that time.

This will almost certainly bite me in the ass later somehow, but
for now it gives a small speedup.

.docker/entrypoint.sh

         go get -d -v ./... >/dev/null
         go install ./... >/dev/null
     fi
+    export GOGC=off
     time "${GOPATH}/bin/$1"
 fi

run.sh

 #!/bin/bash
 
-IMAGE=csmith/aoc-2019-01
+IMAGE=csmith/aoc-2019-02
 
 docker image inspect $IMAGE >/dev/null 2>&1
 if [ $? -ne 0 ]