Dockerfile: install nano as alternative to vim

I'm horrible at vim, and use nano as my go-to editor for quick changes.
Let's install nano in the dev-container as alternative to vim for those
like me, who are not so vim-savvy ^O^C^C:wq:

Signed-off-by: Sebastiaan van Stijn <github@gone.nl>

Dockerfile

@@ -512,6 +512,7 @@ RUN --mount=type=cache,sharing=locked,id=moby-dev-aptlib,target=/var/lib/apt \
             libnl-3-200 \
             libprotobuf-c1 \
             libyajl2 \
+            nano \
             net-tools \
             netcat-openbsd \
             patch \