dist-git requires a bounce host

We still have a need to do make BUILDID="" dist-git in the builder container, which by default can try to clone dist-git. You can't always run this out of the container, because some kernels aren't compatible with a modern system for whatever reason, e.g.

rhel-9]$ make BUILDID="" dist-git
make -C redhat dist-git 
make[1]: Entering directory '/home/xiubli/workspace/rhel-9/redhat'
DISTLOCALVERSION is "".
grep: warning: stray \ before white space
grep: warning: stray \ before white space
grep: warning: stray \ before white space
grep: warning: stray \ before white space
grep: warning: stray \ before white space
grep: warning: stray \ before white space
grep: warning: stray \ before white space
grep: warning: stray \ before white space
linux-5.14.0-284.146.1.el9_2.tar.xz unchanged...
grep: warning: stray \ before white space
grep: warning: stray \ before white space
grep: warning: stray \ before white space
grep: warning: stray \ before white space
grep: warning: stray \ before white space
grep: warning: stray \ before white space
grep: warning: stray \ before white space
grep: warning: stray \ before white space
Gathering new log entries since f0912837a395e668c468bb704e36604e9e0d1f52
MARKER is v5.14
grep: warning: stray \ before white space
grep: warning: stray \ before white space
cd /home/xiubli/workspace/rhel-9/redhat/configs; ./build_configs.sh "partial" "snip"
grep: warning: stray \ before white space
grep: warning: stray \ before white space

So we should setup the bounce host so people don't have to worry about this and it "just works" in the container.