Fix Dockerfile.

Signed-off-by: SuperQ <superq@gmail.com>

Author: SuperQ

Dockerfile

@@ -5,7 +5,7 @@ LABEL maintainer="Ben Kochie <superq@gmail.com>"
 
 ARG ARCH="amd64"
 ARG OS="linux"
-COPY .build/${OS}-${ARCH}/pgbouncer_exporter /bin/chrony_exporter
+COPY .build/${OS}-${ARCH}/chrony_exporter /bin/chrony_exporter
 COPY LICENSE                                /LICENSE
 
 USER       nobody