chore: remove unused Vagrant release image (#13625)

* chore: remove unused Vagrant release image

Signed-off-by: Kay Yan <kay.yan@daocloud.io>

* docs: keep Vagrant image retirement in release notes

Signed-off-by: Kay Yan <kay.yan@daocloud.io>

---------

Signed-off-by: Kay Yan <kay.yan@daocloud.io>

test-infra/vagrant-docker/Dockerfile

@@ -1,16 +0,0 @@
-# Docker image published at quay.io/kubespray/vagrant
-
-ARG KUBESPRAY_VERSION
-FROM quay.io/kubespray/kubespray:${KUBESPRAY_VERSION}
-
-ENV VAGRANT_VERSION=2.3.7
-ENV VAGRANT_DEFAULT_PROVIDER=libvirt
-ENV VAGRANT_ANSIBLE_TAGS=facts
-
-RUN apt-get update && apt-get install -y wget libvirt-dev openssh-client rsync git build-essential
-
-# Install Vagrant
-RUN wget https://releases.hashicorp.com/vagrant/${VAGRANT_VERSION}/vagrant_${VAGRANT_VERSION}-1_amd64.deb && \
- dpkg -i vagrant_${VAGRANT_VERSION}-1_amd64.deb && \
- rm vagrant_${VAGRANT_VERSION}-1_amd64.deb && \
- vagrant plugin install vagrant-libvirt

test-infra/vagrant-docker/README.md

@@ -1,24 +0,0 @@
-# vagrant docker image
-
-This image is used for the vagrant CI jobs. It is using the libvirt driver.
-
-## Usage
-
-```console
-$ docker run --net host --rm -it -v /var/run/libvirt/libvirt-sock:/var/run/libvirt/libvirt-sock quay.io/kubespray/vagrant
-$ vagrant up
-Bringing machine 'k8s-1' up with 'libvirt' provider...
-Bringing machine 'k8s-2' up with 'libvirt' provider...
-Bringing machine 'k8s-3' up with 'libvirt' provider...
-[...]
-```
-
-## Cache
-
-You can set `/root/kubespray_cache` as a volume to keep cache between runs.
-
-## Building
-
-```shell
-./build.sh v2.12.5
-```

test-infra/vagrant-docker/build.sh

@@ -1,13 +0,0 @@
-#!/bin/sh
-set -euo pipefail
-
-if [ "$#" -ne 1 ]; then
-  echo "Usage: $0 tag" >&2
-  exit 1
-fi
-
-VERSION="$1"
-IMG="quay.io/kubespray/vagrant:${VERSION}"
-
-docker build . --build-arg "KUBESPRAY_VERSION=${VERSION}" --tag "$IMG"
-docker push "$IMG"