CI: libnetconf2 upstream now requires PAM

Depends-on: https://gerrit.cesnet.cz/c/CzechLight/dependencies/+/5879
Depends-on: https://gerrit.cesnet.cz/c/CzechLight/br2-external/+/5883
Change-Id: Ibcbf5bdc4cacd2ec82c2d165166b1d77df268ac0
diff --git a/ci/pre.yaml b/ci/pre.yaml
index 4c71e88..5d3bfe9 100644
--- a/ci/pre.yaml
+++ b/ci/pre.yaml
@@ -5,3 +5,9 @@
         name: pcre2-devel
         state: present
       become: true
+
+    - name: install PAM
+      package:
+        name: pam-devel
+        state: present
+      become: true