provision: Set samba as dns for the host in idmci

Samba role needs to handle dns on the machine to work properly.
The upstrem dns is set as forwarder for the samba.

src/ansible/roles/samba/tasks/main.yml

@@ -62,12 +62,13 @@
   # In containers the file is a mounted from outside so
   # we change the content.
   - name: Change resolv.conf
-    lineinfile:
+    blockinfile:
       path: /etc/resolv.conf
       insertbefore: BOF
-      line: "nameserver {{ hostvars[groups.dns.0]['ansible_facts']['default_ipv4']['address'] }}"
+      block: |
+        nameserver 127.0.0.1
+        nameserver {{ hostvars[groups.dns.0]['ansible_facts']['default_ipv4']['address'] }}
     when:
-    - '"resolv.conf" in mounts.stdout'
     - '"dns" in groups and groups["dns"]'
   - name: Remove systemd-resolved package
     ansible.builtin.package:
@@ -87,6 +88,17 @@
   args:
     creates: /etc/samba/smb.conf
 
+- name: Set forwarder to dns server
+  ini_file:
+    path: /etc/samba/smb.conf
+    section: global
+    option: "dns forwarder"
+    value: "{{ hostvars[groups.dns.0]['ansible_facts']['default_ipv4']['address'] }}"
+    mode: '0600'
+    backup: no
+  when:
+  - '"dns" in groups and groups["dns"]'
+
 - name: Setup Kerberos
   copy:
     src:  /var/lib/samba/private/krb5.conf