Fix Alpine docker image size.

Author: Yannig

alpine/Dockerfile

@@ -31,14 +31,14 @@ ENV VERSION ${VERSION:-0.1.0}
 
 RUN apk add libaio
 
-COPY --from=build $LD_LIBRARY_PATH $LD_LIBRARY_PATH
+COPY --from=build /usr/lib/oracle /usr/lib/oracle
 COPY --from=build /go/src/oracledb_exporter/oracledb_exporter /oracledb_exporter
 ADD ./default-metrics.toml /default-metrics.toml
 
 ARG ORACLE_VERSION
 ENV ORACLE_VERSION=${ORACLE_VERSION}
 ENV LD_LIBRARY_PATH "/usr/lib/oracle/${ORACLE_VERSION}/client64/lib"
-RUN echo $LD_LIBRARY_PATH >> /etc/ld.so.conf.d/oracle.conf && ldconfig
+RUN ldconfig "$LD_LIBRARY_PATH"
 
 ENV DATA_SOURCE_NAME system/oracle@oracle/xe