Fix browser caching issue in deployment script

When extracting the jar file, jar xf restores the timestamp of the file as it was
in the jarfile. This is not ideal, because it artificially sets the change time of
the file to the past, and therefore browser caches will ignore the new file.

ansible/install-app.yml

@@ -60,12 +60,12 @@
       group: iam-dev
       mode: 0664
       backup: true
-    register: warfile
 
     # unpack the cs.war file
   - name: unpack cs.war
-    shell: "rm -rf /data/webapps/cs; mkdir /data/webapps/cs; cd /data/webapps/cs; jar xf /data/local/wars/cs.war"
-    when: warfile.changed
+    # When unzipping, use -DD to update the last modified time of each extracted file
+    # Otherwise, the browser cache will not pick up the new version of the file!
+    shell: "rm -rf /data/webapps/cs; mkdir /data/webapps/cs; cd /data/webapps/cs; unzip -DD /data/local/wars/cs.war"
     notify:
       - restart tomcat