Move docker build stuff into a subdirectory. Update structure to retire manual-{pre,post}

docker/files/etc/bird/bird-local.conf

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+# Containerlab user overrides go in this file.

docker/files/etc/bird/bird.conf

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+# Bird2 configuration for VPP Containerlab
+
+# router id 192.0.2.0;
+
+timeformat base         iso long;
+timeformat log          iso long;
+timeformat protocol     iso long;
+timeformat route        iso long;
+
+log "/var/log/bird/bird.log" { debug, trace, info, remote, warning, error, auth, fatal, bug };
+
+protocol device { scan time 30; }
+
+protocol direct { ipv4; ipv6; check link yes; }
+
+protocol kernel kernel4 {
+  ipv4 { import none; export where source != RTS_DEVICE; };
+  learn off; scan time 300;
+}
+
+protocol kernel kernel6 {
+  ipv6 { import none; export where source != RTS_DEVICE; };
+  learn off; scan time 300;
+}
+        
+include "bird-local.conf";

docker/files/etc/vpp/bootstrap.vpp

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+exec /etc/vpp/clab.vpp
+exec /etc/vpp/vppcfg.vpp

docker/files/etc/vpp/clab.vpp

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+comment { This file will be overwritten / generated by containerlab upon deploy }

docker/files/etc/vpp/startup.conf

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+# This is the vpp-containerlab default startup.conf, which is meant to be
+# overridden by Containerlab's node/fdio_vpp/vpp_startup_config.go.tpl
+
+unix {
+  interactive
+  log /var/log/vpp/vpp.log
+  full-coredump
+  cli-listen /run/vpp/cli.sock
+  cli-prompt vpp-clab#
+  cli-no-pager
+  poll-sleep-usec 100
+  exec /etc/vpp/bootstrap.vpp
+}
+
+api-trace {
+  on
+}
+
+memory {
+  main-heap-size 512M
+  main-heap-page-size 4k
+}
+
+buffers {
+  buffers-per-numa 16000
+  default data-size 2048
+  page-size 4k
+}
+
+statseg {
+  size 64M
+  page-size 4k
+  per-node-counters on
+}
+
+plugins {
+  plugin default { enable }
+  plugin dpdk_plugin.so { disable }
+  plugin linux_cp_plugin.so { enable }
+  plugin linux_nl_plugin.so { enable }
+  plugin sflow_plugin.so { enable }
+}
+
+linux-cp {
+  default netns dataplane
+  lcp-sync
+  lcp-auto-subint
+  del-static-on-link-down
+  del-dynamic-on-link-down
+}

docker/files/init-container.sh

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+#!/usr/bin/env bash
+
+STARTUP_CONFIG=${STARTUP_CONFIG:="/etc/vpp/startup.conf"}
+CLAB_VPP_FILE=${CLAB_VPP_FILE:=/etc/vpp/clab.vpp}
+VPPCFG_VPP_FILE=${VPPCFG_VPP_FILE:=/etc/vpp/vppcfg.vpp}
+NETNS=${NETNS:="dataplane"}
+BIRD_ENABLED=${BIRD_ENABLED:="true"}
+
+echo "Creating dataplane namespace"
+/usr/bin/mkdir -p /etc/netns/$NETNS
+/usr/bin/touch /etc/netns/$NETNS/resolv.conf
+/usr/sbin/ip netns add $NETNS
+
+echo "Starting SSH, with credentials root:vpp"
+sed -i -e 's,^#PermitRootLogin prohibit-password,PermitRootLogin yes,' /etc/ssh/sshd_config
+sed -i -e 's,^root:.*,root:$y$j9T$kG8pyZEVmwLXEtXekQCRK.$9iJxq/bEx5buni1hrC8VmvkDHRy7ZMsw9wYvwrzexID:20211::::::,' /etc/shadow
+/etc/init.d/ssh start
+
+if [ "$BIRD_ENABLED" == "true" ]; then
+  echo "Starting Bird in $NETNS"
+  mkdir -p /run/bird /var/log/bird
+  chown bird:bird /var/log/bird
+  ROUTERID=$(ip -br a show eth0 | awk '{ print $3 }' | cut -f1 -d/)
+  sed -i -e "s,.*router id .*,router id $ROUTERID; # Set by container-init.sh," /etc/bird/bird.conf
+  /usr/bin/nsenter --net=/var/run/netns/$NETNS /usr/sbin/bird -u bird -g bird
+fi
+
+echo "Generating $CLAB_VPP_FILE"
+: > $CLAB_VPP_FILE
+MTU=9216
+for IFNAME in $(ip -br link show type veth | cut -f1 -d@ | grep -v '^eth0$' | sort); do
+  MAC=$(ip -br link show dev $IFNAME | awk '{ print $3 }')
+  echo " * $IFNAME hw-addr $MAC mtu $MTU"
+  ip link set $IFNAME up mtu $MTU
+  cat << EOF >> $CLAB_VPP_FILE
+create host-interface name $IFNAME hw-addr $MAC
+set interface name host-$IFNAME $IFNAME
+set interface mtu $MTU $IFNAME
+set interface state $IFNAME up
+
+EOF
+done
+
+echo "Generating $VPPCFG_VPP_FILE"
+: > $VPPCFG_VPP_FILE
+if [ -r /etc/vpp/vppcfg.yaml ]; then
+  vppcfg plan --novpp -c /etc/vpp/vppcfg.yaml -o $VPPCFG_VPP_FILE
+fi
+
+echo "Starting VPP"
+exec /usr/bin/vpp -c $STARTUP_CONFIG