CI: build and run unit tests

Run `make check` after the project is built in every runner.

Signed-off-by: Iker Pedrosa <ipedrosa@redhat.com>

share/containers/debian.dockerfile

@@ -9,7 +9,7 @@ RUN export DEBIAN_PRIORITY=critical \
 RUN apt-get update -y \
     && apt-get dist-upgrade -y
 RUN apt-get build-dep shadow -y
-RUN apt-get install libbsd-dev pkgconf -y
+RUN apt-get install libbsd-dev libcmocka-dev pkgconf -y
 
 COPY ./ /usr/local/src/shadow/
 WORKDIR /usr/local/src/shadow/
@@ -17,6 +17,7 @@ WORKDIR /usr/local/src/shadow/
 RUN ./autogen.sh --without-selinux --enable-man --with-yescrypt
 RUN make -kj4 || true
 RUN make
+RUN make check
 RUN make install
 
 FROM scratch AS export