remove mkdir from dockerfile (hashicorp#132)

Author: inductor

Dockerfile

@@ -2,8 +2,6 @@ FROM alpine:3
 
 RUN ["/bin/sh", "-c", "apk add --update --no-cache bash ca-certificates curl git jq openssh"]
 
-RUN ["bin/sh", "-c", "mkdir -p /src"]
-
 COPY ["src", "/src/"]
 
 ENTRYPOINT ["/src/main.sh"]