Move Vagrant-based tests from GitHub Actions to Cirrus CI

Cirrus CI supports nested virtualization and free to use from open
source projects. runc has been using the service since
https://github.com/opencontainers/runc/pull/3088.

Signed-off-by: Kazuyoshi Kato <katokazu@amazon.com>

.github/workflows/ci.yml

@@ -508,106 +508,3 @@ jobs:
           name: TestResults MacOS
           path: |
             *-junit.xml
-
-  vagrant:
-    name: Vagrant
-    # nested virtualization is only available on macOS hosts
-    runs-on: macos-10.15
-    timeout-minutes: 45
-    needs: [project, linters, protos, man]
-    strategy:
-      fail-fast: false
-      matrix:
-        # Currently crun is disabled to decrease CI flakiness.
-        # We can enable crun again when we get a better CI infra.
-        runc: [runc]
-        # Fedora is for testing cgroup v2 functionality, Rocky Linux is for testing on an enterprise-grade environment
-        box: ["fedora/35-cloud-base", "rockylinux/8"]
-    env:
-      GOTEST: gotestsum --
-    steps:
-      - uses: actions/checkout@v2
-
-      - name: "Cache ~/.vagrant.d/boxes"
-        uses: actions/cache@v2
-        with:
-          path: ~/.vagrant.d/boxes
-          key: vagrant-${{ hashFiles('Vagrantfile*') }}
-
-      - name: Vagrant start
-        env:
-          BOX: ${{ matrix.box }}
-        run: |
-          if [ "$BOX" = "rockylinux/8" ]; then
-            # The latest version 5.0.0 seems 404 (as of March 30, 2022)
-            export BOX_VERSION="4.0.0"
-          fi
-          # Retry if it fails (download.fedoraproject.org returns 404 sometimes)
-          vagrant up || vagrant up
-
-      - name: Integration
-        env:
-          RUNC_FLAVOR: ${{ matrix.runc }}
-          SELINUX: Enforcing
-          GOTESTSUM_JUNITFILE: /tmp/test-integration-junit.xml
-        run: vagrant up --provision-with=selinux,install-runc,install-gotestsum,test-integration
-
-      - name: CRI test
-        env:
-          RUNC_FLAVOR: ${{ matrix.runc }}
-          SELINUX: Enforcing
-          REPORT_DIR: /tmp/critestreport
-        run: vagrant up --provision-with=selinux,install-runc,install-gotestsum,test-cri
-
-      - name: Collect the VM's IP address for Docker Hub's throttling issue
-        if: failure()
-        run: vagrant ssh -- curl https://api64.ipify.org/
-
-      - name: Get test reports
-        if: always()
-        run: |
-          set -e
-          vagrant plugin install vagrant-vbguest
-          vagrant plugin install vagrant-scp
-          vagrant scp :/tmp/test-integration-junit.xml "${{ github.workspace }}/"
-          vagrant scp :/tmp/critestreport "${{ github.workspace }}/critestreport"
-      - uses: actions/upload-artifact@v2
-        if: always()
-        with:
-          # ${{ matrix.box }} cannot be used here due to character limitation
-          name:  TestResults vagrant ${{ github.run_id }} ${{ matrix.runtime }} ${{matrix.runc}}
-          path: |
-            ${{github.workspace}}/*-junit.xml
-            ${{github.workspace}}/critestreport/*
-
-  cgroup2-misc:
-    name: CGroupsV2 - rootless CRI test
-    # nested virtualization is only available on macOS hosts
-    runs-on: macos-10.15
-    timeout-minutes: 45
-    needs: [project, linters, protos, man]
-    steps:
-      - uses: actions/checkout@v2
-
-      - name: "Cache ~/.vagrant.d/boxes"
-        uses: actions/cache@v2
-        with:
-          path: ~/.vagrant.d/boxes
-          key: vagrant-${{ hashFiles('Vagrantfile*') }}
-
-      - name: Vagrant start
-        run: |
-          # Retry if it fails (download.fedoraproject.org returns 404 sometimes)
-          vagrant up || vagrant up
-
-      # slow, so separated from the regular cgroup2 task
-      - name: CRI-in-UserNS test with Rootless Podman
-        run: |
-          vagrant up --provision-with=install-rootless-podman
-          # Execute rootless podman to create the UserNS env
-          vagrant ssh -- podman build --target cri-in-userns -t cri-in-userns -f /vagrant/contrib/Dockerfile.test /vagrant
-          vagrant ssh -- podman run --rm --privileged cri-in-userns
-
-      - name: Collect the VM's IP address for Docker Hub's throttling issue
-        if: failure()
-        run: vagrant ssh -- curl https://api64.ipify.org/