Consolidate FRR+Bird+VPP into /config for bind-mounting; Move to multitool for the linux client, it has SSH

BUILDING.md

@@ -129,7 +129,7 @@ VPPDEBS=~/src/vpp/build-root
 
 # Step 1: build amd64 on summer, push with platform tag
 docker buildx build --platform linux/amd64 \
-  --build-context vppdebs=$VPPDEBS \
+  --no-cache --build-context vppdebs=$VPPDEBS \
   --push --tag $IMG:latest-amd64 \
   -f docker/Dockerfile docker/
 
@@ -138,7 +138,7 @@ docker buildx build --platform linux/amd64 \
 #   Note: $IMG and $VPPDEBS expand on summer before being sent over SSH -- set them first.
 ssh jessica-orb "cd ~/src/vpp-containerlab && \
   docker buildx build --platform linux/arm64 \
-    --build-context vppdebs=$VPPDEBS \
+    --no-cache --build-context vppdebs=$VPPDEBS \
     --push --tag $IMG:latest-arm64 \
     -f docker/Dockerfile docker/"