Revert "fix"

This reverts commit 5aa0ab8fad.

telegraf/Dockerfile

@@ -18,6 +18,9 @@ ENV \
     PS1="$(whoami)@$(hostname):$(pwd)$ " \
     TERM="xterm-256color"
 
+# Copy root filesystem
+COPY rootfs /
+
 # Set shell
 SHELL ["/bin/bash", "-o", "pipefail", "-c"]
 
@@ -39,10 +42,6 @@ RUN set -ex && \
     apt-get install telegraf=${TELEGRAF_VERSION} && \
     rm -rf /var/lib/apt/lists/*
 
-# Copy root filesystem
-COPY rootfs /
-
-WORKDIR /tmp
 EXPOSE 8125/udp 8092/udp 8094
 
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