CI: drop CentOS 7

.github/workflows/main.yaml

@@ -17,34 +17,3 @@ jobs:
     steps:
     - uses: actions/checkout@v2
     - run: DOCKER_BUILDKIT=1 docker build -f Dockerfile.buildtests .
-  test-centos7:
-    runs-on: macos-12
-    env:
-      LIBSECCOMP_COMMIT: v2.3.3
-      LIBSLIRP_COMMIT: v4.1.0
-      BENCHMARK_IPERF3_DURATION: 3
-    steps:
-    - uses: actions/checkout@v2
-    - name: Setup CentOS 7 VM
-      run: |
-        vagrant up --provision --no-tty
-        cat > ./run-vagrant-tests <<'EOF'
-        exec vagrant ssh --no-tty -c "
-          export LIBSECCOMP_COMMIT=\"${LIBSECCOMP_COMMIT}\"
-          export LIBSLIRP_COMMIT=\"${LIBSLIRP_COMMIT}\"
-          export BENCHMARK_IPERF3_DURATION=\"${BENCHMARK_IPERF3_DURATION}\"
-          /src/build-and-test
-        "
-        EOF
-    - name: Build and test with Debian 10's version of libseccomp
-      run: sh ./run-vagrant-tests
-    - name: Build and test with Ubuntu 20.04's versions of libseccomp/libslirp
-      run: sh ./run-vagrant-tests
-      env:
-        LIBSECCOMP_COMMIT: v2.4.3
-        LIBSLIRP_COMMIT: v4.1.0
-    - name: Build and test with recent versions of libseccomp/libslirp
-      run: sh ./run-vagrant-tests
-      env:
-        LIBSECCOMP_COMMIT: v2.5.4
-        LIBSLIRP_COMMIT: v4.7.0

Dockerfile.buildtests

@@ -28,7 +28,6 @@ FROM buildtest-ubuntu1804-common AS buildtest-ubuntu1804-dynamic
 RUN ./configure && make && cp -f slirp4netns /
 
 # CentOS 7 is no longer tested in this file.
-# See Vagrantfile for CentOS 7 tests.
 
 # openSUSE (dynamic only)
 FROM opensuse/leap:15 AS buildtest-opensuse15-common