.github: enable new testserv plugin, regression testing

Signed-off-by: Joachim Wiberg <troglobit@gmail.com>

.github/workflows/build.yml

@@ -37,7 +37,8 @@ jobs:
       - name: Regular Finit
         run: |
           ./configure --prefix=/usr --exec-prefix= --sysconfdir=/etc --localstatedir=/var \
-                      --enable-x11-common-plugin --with-watchdog --with-keventd
+                      --enable-x11-common-plugin --enable-testserv-plugin --with-watchdog \
+                      --with-keventd
           make clean
           make V=1
       - name: Install to /tmp