Remove CentOS8 from test suite (#5682)

.github/workflows/test.yml

@@ -63,7 +63,6 @@ jobs:
             ubuntu_22,
             ubuntu_23,
             ubuntu_24,
-            centos_8,
             centos_9,
             fedora_39,
             fedora_40,

test/_centos_8.Dockerfile

@@ -1,18 +0,0 @@
-FROM quay.io/centos/centos:stream8
-RUN yum install -y git initscripts
-
-ENV GITDIR /etc/.pihole
-ENV SCRIPTDIR /opt/pihole
-
-RUN mkdir -p $GITDIR $SCRIPTDIR /etc/pihole
-ADD . $GITDIR
-RUN cp $GITDIR/advanced/Scripts/*.sh $GITDIR/gravity.sh $GITDIR/pihole $GITDIR/automated\ install/*.sh $SCRIPTDIR/
-ENV PATH /usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:$SCRIPTDIR
-
-RUN true && \
-    chmod +x $SCRIPTDIR/*
-
-ENV SKIP_INSTALL true
-ENV OS_CHECK_DOMAIN_NAME dev-supportedos.pi-hole.net
-
-#sed '/# Start the installer/Q' /opt/pihole/basic-install.sh > /opt/pihole/stub_basic-install.sh && \

test/tox.centos_8.ini

@@ -1,8 +0,0 @@
-[tox]
-envlist = py3
-
-[testenv:py3]
-allowlist_externals = docker
-deps = -rrequirements.txt
-commands =  docker buildx build --load --progress plain -f _centos_8.Dockerfile -t pytest_pihole:test_container ../
-            pytest {posargs:-vv -n auto} ./test_any_automated_install.py ./test_any_utils.py ./test_centos_fedora_common_support.py