Re-add Ubuntu21 tests

Signed-off-by: Christian König <ckoenig@posteo.de>

.github/workflows/test.yml

@@ -31,7 +31,7 @@ jobs:
     needs: smoke-test
     strategy:
       matrix:
-        distro: [debian_10, debian_11, ubuntu_18, ubuntu_20, ubuntu_22, centos_8, fedora_34]
+        distro: [debian_10, debian_11, ubuntu_18, ubuntu_20, ubuntu_21, ubuntu_22, centos_8, fedora_34]
     env:
       DISTRO: ${{matrix.distro}}
     steps:

test/_ubuntu_21.Dockerfile

@@ -0,0 +1,18 @@
+FROM buildpack-deps:impish-scm
+
+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
+ENV DEBIAN_FRONTEND=noninteractive
+
+RUN true && \
+    chmod +x $SCRIPTDIR/*
+
+ENV PH_TEST 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.ubuntu_21.ini

@@ -0,0 +1,8 @@
+[tox]
+envlist = py38
+
+[testenv]
+whitelist_externals = docker
+deps = -rrequirements.txt
+commands = docker build -f _ubuntu_21.Dockerfile -t pytest_pihole:test_container ../
+           pytest {posargs:-vv -n auto} ./test_any_automated_install.py ./test_any_utils.py