Add correct path to service-account. Forgot this got reverted :(

Dockerfile

@@ -12,6 +12,7 @@ WORKDIR /app
 ENV SRC_DIR=/go/src/github.com/ubclaunchpad/bumper/server
 RUN apk add --update --no-cache git
 ADD server $SRC_DIR
+ADD server/service-account.json .
 WORKDIR $SRC_DIR
 RUN go get -u github.com/golang/dep/cmd/dep
 RUN dep ensure --vendor-only