Remove the expose call

Signed-off-by: Maksim Nabokikh <[email protected]>

Dockerfile

@@ -31,7 +31,7 @@ COPY . .
 
 # Propagate Dex version from build args to the build environment
 ARG VERSION
-RUN ([ "$VERSION" != "" ] || export $VERSION) && make release-binary
+RUN make release-binary
 
 RUN xx-verify /go/bin/dex && xx-verify /go/bin/docker-entrypoint