<p>Here document does not work ;)<br>
At least, it can be supported from Docker 2.0.<br>
Ref: <code>https://github.com/moby/moby/issues/1554#issuecomment-196544146</code></p>
<pre><code>RUN cat <<EOF >> /etc/dnf/dnf.conf
deltarpm=0
install_weak_deps=0
tsflags=nodocs
EOF
</code></pre>
<p>Brackets also does not work ;)</p>
<pre><code>RUN (
  echo deltarpm=0
  echo install_weak_deps=0
  echo tsflags=nodocs
) >> /etc/dnf/dnf.conf
</code></pre>
<p>Sadly, finally only escape long line. ;)</p>

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