Add Debian 13 Trixie to the test suite

Signed-off-by: Christian König <github@yubiuser.dev>

test/_debian_13.Dockerfile

@@ -0,0 +1,16 @@
+FROM buildpack-deps:trixie-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 $GITDIR/advanced/Scripts/COL_TABLE $SCRIPTDIR/
+ENV PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:$SCRIPTDIR
+
+RUN true && \
+    chmod +x $SCRIPTDIR/*
+
+ENV SKIP_INSTALL=true
+
+#sed '/# Start the installer/Q' /opt/pihole/basic-install.sh > /opt/pihole/stub_basic-install.sh && \