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

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

@@ -0,0 +1 @@
+# 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

@@ -0,0 +1 @@
+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
+}