update circleci to build image from source

Dockerfile

@@ -1,10 +1,3 @@
-FROM quay.io/vektorcloud/glibc:latest
-
-ARG CTOP_VERSION=0.5
-ENV CTOP_URL https://github.com/bcicen/ctop/releases/download/v${CTOP_VERSION}/ctop-${CTOP_VERSION}-linux-amd64
-
-RUN echo $CTOP_URL && \
-    wget -q $CTOP_URL -O /ctop && \
-    chmod +x /ctop
-
+FROM scratch
+COPY ./ctop /ctop
 ENTRYPOINT ["/ctop"]

Makefile

@@ -22,7 +22,7 @@ build-all:
 image:
 	docker build -t ctop_build -f Dockerfile_build .
 	docker run -ti --rm -v $(shell pwd):/target ctop_build cp -v /go/bin/ctop /target/
-	docker build -t ctop -f Dockerfile_minimal .
+	docker build -t ctop -f Dockerfile .
 
 release:
 	mkdir release

circle.yml

@@ -7,7 +7,7 @@ machine:
 dependencies:
   override:
     - docker info
-    - docker build --build-arg CTOP_VERSION=$(cat VERSION) -t ctop .
+    - make image
 
 test:
   override: