Remove several unused containers

* alpine-*: looks like they were never used
* debian-{jessie,stretch}-*: EOL
* debian9-repo-install-test: EOL
* gitolite: never used? / upstream container last updated 3 years ago
* osmo-gerrit-libosmo: unused example from 2017, based on jessie
* patchwork: looks like never used, ancient version
* public-inbox: added in 2018 for playing around, apparently unused
* tmp: unfinished and unused
* ubuntu-zesty-build: was added for testing ubuntu 17.04, unused

Related: OS#5601
Change-Id: Ic09046379ddff049629bb66850ead7ba479c4450
---
D alpine-build/Dockerfile
D alpine-build/Makefile
D alpine-lighttpd/Dockerfile
D alpine-lighttpd/Makefile
D alpine-lighttpd/index.html
D alpine-lighttpd/ipv6.conf
D debian-jessie-build/Dockerfile
D debian-jessie-build/Makefile
D debian-jessie-buildslave-st/Dockerfile
D debian-jessie-buildslave-st/Makefile
D debian-jessie-buildslave/Dockerfile
D debian-jessie-buildslave/Makefile
D debian-jessie-osmocom/Dockerfile
D debian-jessie-osmocom/Makefile
D debian-stretch-build/Dockerfile
D debian-stretch-build/Makefile
D debian-stretch-jenkins/Dockerfile
D debian-stretch-jenkins/Makefile
D debian-stretch-obs-latest/Dockerfile
D debian-stretch-obs-latest/Makefile
D debian9-repo-install-test/Dockerfile
D debian9-repo-install-test/Makefile
D gitolite/Dockerfile
D gitolite/Makefile
D osmo-gerrit-libosmo/Dockerfile
D osmo-gerrit-libosmo/Makefile
D patchwork/Dockerfile
D patchwork/Dockerfile.fdo
D patchwork/Dockerfile.upstream
D patchwork/Makefile
D patchwork/docker-entrypoint.sh
D patchwork/production.py
D public-inbox/Dockerfile
D public-inbox/Makefile
D tmp/docker-compose.yml
D ubuntu-zesty-build/Dockerfile
D ubuntu-zesty-build/Makefile
37 files changed, 0 insertions(+), 1,130 deletions(-)