Fix the Zulu repo removal.

tasks/openjdk_deb.yml

@@ -53,7 +53,12 @@
     file:
       dest: /etc/apt/sources.list.d/zulu-openjdk.list
       state: absent
-      update_cache: yes
+      register: zulu_repo_removal
+
+  - name: Update the apt cache
+    apt:
+      update_cache: True
+    when: zulu_repo_removal is changed
 
   - name: Install the OpenJDK that comes with the distribution
     apt: pkg=openjdk-{{ item.0 }}-{{ item[1] }} state={{ openjdk_pkg_state }} update_cache=yes cache_valid_time=3600