adjust koordlet.dockerfile commands sequence

softwares installed by apt install is more stable than source code,
install them first can make better use of the docker build cache

Signed-off-by: j4ckstraw <j4ckstraw@foxmail.com>

docker/koordlet.dockerfile

@@ -7,6 +7,15 @@ ENV VERSION $VERSION
 ENV GOOS linux
 ENV GOARCH $TARGETARCH
 
+RUN apt update && apt install -y bash build-essential cmake wget
+RUN wget https://sourceforge.net/projects/perfmon2/files/libpfm4/libpfm-4.13.0.tar.gz && \
+  echo "bcb52090f02bc7bcb5ac066494cd55bbd5084e65  libpfm-4.13.0.tar.gz" | sha1sum -c && \
+  tar -xzf libpfm-4.13.0.tar.gz && \
+  rm libpfm-4.13.0.tar.gz
+RUN export DBG="-g -Wall" && \
+  make -e -C libpfm-4.13.0 && \
+  make install -C libpfm-4.13.0
+
 COPY go.mod go.mod
 COPY go.sum go.sum
 
@@ -16,14 +25,6 @@ COPY apis/ apis/
 COPY cmd/ cmd/
 COPY pkg/ pkg/
 
-RUN apt update && apt install -y bash build-essential cmake wget
-RUN wget https://sourceforge.net/projects/perfmon2/files/libpfm4/libpfm-4.13.0.tar.gz && \
-  echo "bcb52090f02bc7bcb5ac066494cd55bbd5084e65  libpfm-4.13.0.tar.gz" | sha1sum -c && \
-  tar -xzf libpfm-4.13.0.tar.gz && \
-  rm libpfm-4.13.0.tar.gz
-RUN export DBG="-g -Wall" && \
-  make -e -C libpfm-4.13.0 && \
-  make install -C libpfm-4.13.0
 RUN go build -a -o koordlet cmd/koordlet/main.go
 
 # The CUDA container images provide an easy-to-use distribution for CUDA supported platforms and architectures.