THRIFT-3907 Skip Docker image build on CI when unchanged
diff --git a/build/docker/centos/Dockerfile b/build/docker/centos/Dockerfile
index a31492b..59bbfd6 100644
--- a/build/docker/centos/Dockerfile
+++ b/build/docker/centos/Dockerfile
@@ -138,5 +138,5 @@
ENV THRIFT_ROOT /thrift
RUN mkdir -p $THRIFT_ROOT/src
-COPY scripts $THRIFT_ROOT
+COPY Dockerfile $THRIFT_ROOT/
WORKDIR $THRIFT_ROOT/src
diff --git a/build/docker/centos/scripts/keepit b/build/docker/centos/scripts/keepit
deleted file mode 100644
index cb885df..0000000
--- a/build/docker/centos/scripts/keepit
+++ /dev/null
@@ -1 +0,0 @@
-keep it