Move docker image to alpine

Dockerfile

@@ -1,8 +1,14 @@
-FROM scratch
+FROM alpine
 
-ADD https://rootcastore.hub.luzifer.io/v1/store/latest /etc/ssl/ca-bundle.pem
-ADD promcertcheck /promcertcheck
+ENV GOPATH /go:/go/src/github.com/Luzifer/promcertcheck/Godeps/_workspace
+
+ADD . /go/src/github.com/Luzifer/promcertcheck
+WORKDIR /go/src/github.com/Luzifer/promcertcheck
+
+RUN apk --update add git go ca-certificates \
+ && go install -ldflags "-X main.version=$(git describe --tags || git rev-parse --short || echo dev)" \
+ && apk --purge del git go
 
 EXPOSE 3000
-ENTRYPOINT ["/promcertcheck"]
+ENTRYPOINT ["/go/bin/promcertcheck"]
 CMD ["--probe=https://www.google.com/", "--probe=https://www.facebook.com/"]

Makefile

@@ -12,8 +12,5 @@ test:
 		--probe="https://www.itpad.de/" \
 		--probe="https://mondash.org/"
 
-container: build
+container:
 	docker build -t luzifer/promcertcheck .
-
-build:
-	docker run -v $(CURDIR):/src -e LDFLAGS='-X main.version $(VERSION)' centurylink/golang-builder:latest