ansible/setup-jenkins-slave: accept rel-change

Fix for:
  W:This must be accepted explicitly before updates for this repository can be applied. See apt-secure(8) manpage for details.
  E:Repository 'http://raspbian.raspberrypi.org/raspbian buster InRelease' changed its 'Suite' value from 'stable' to 'oldstable'

Related: https://github.com/ansible/ansible/issues/48352
Change-Id: I90ee8dd49001d6810f2118e9feff3375e87052ea

ansible/roles/apt-allow-relinfo-change/README.md

@@ -0,0 +1,12 @@
+---
+When the suite of one debian release changes from stable to oldstable, apt
+stops working with the following error:
+
+```
+W:This must be accepted explicitly before updates for this repository can be applied. See apt-secure(8) manpage for details.
+E:Repository 'http://raspbian.raspberrypi.org/raspbian buster InRelease' changed its 'Suite' value from 'stable' to 'oldstable'
+```
+
+This role configures apt to allow the release info change.
+
+Related: https://github.com/ansible/ansible/issues/48352

ansible/roles/apt-allow-relinfo-change/tasks/main.yml

@@ -0,0 +1,7 @@
+---
+- name: "configure to allow release info change"
+  lineinfile:
+    path: /etc/apt/apt.conf.d/99relinfochange
+    state: present
+    create: yes
+    line: Acquire::AllowReleaseInfoChange::Suite "true";

ansible/setup-jenkins-slave.yml

@@ -15,6 +15,8 @@
         cache_valid_time: 3600
         update_cache: yes
   roles:
+    - name: apt-allow-relinfo-change
+
     - name: docker
       jenkins_user: osmocom-build
       tags: