CI: workaround hardcoded bash shell in alpine

pytest-mh has a hardcoded dependency towards bash shell and the easiest
way to avoid is to install bash and set it as the default shell in
alpine.

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

share/ansible/roles/ci_run/tasks/alpine.yml

@@ -71,3 +71,10 @@
     src: /usr/local/src/shadow/etc/login.defs
     dest: /etc/login.defs
     remote_src: yes
+
+#The following is a workaround
+- name: Create a symbolic link
+  ansible.builtin.file:
+    src: /bin/bash
+    dest: /usr/bin/bash
+    state: link