Dockerfile for checker (#222)

* Dockerfile for checker CLI

* Better error when input is unreadable

Author: vbrown608

checker/Dockerfile

@@ -0,0 +1,11 @@
+FROM golang:1.11-alpine
+
+WORKDIR /go/src/github.com/EFForg/starttls-backend/checker
+
+RUN apk add git
+
+ADD . .
+
+RUN go get github.com/EFForg/starttls-backend/checker/cmd/starttls-check
+
+CMD ["/go/bin/starttls-check"]

checker/totals.go

@@ -76,6 +76,7 @@ func (c *Checker) CheckCSV(domains *csv.Reader, resultHandler ResultHandler, dom
 			data, err := domains.Read()
 			if err != nil {
 				if err != io.EOF {
+					log.Println("Error reading CSV")
 					log.Fatal(err)
 				}
 				break