Better way to do the same thing

Signed-off-by: Aurélien Bompard <aurelien@bompard.org>

playbooks/openshift-apps/fasjson.yml

@@ -10,12 +10,6 @@
 
   vars:
 
-  pre_tasks:
-  - name: create a file with random content to prevent docker from caching the git clone
-    copy:
-      dest: /etc/openshift_apps/fasjson/random-file
-      content: "{{ now() }}"
-
   roles:
   - role: openshift/project
     app: fasjson

roles/openshift-apps/fasjson/templates/Dockerfile

@@ -28,9 +28,8 @@ RUN dnf install -y \
         python3-wheel && \
     dnf autoremove -y && \
     dnf clean all -y
-# Add a file with random content to prevent Docker from caching the git clone step.
-COPY random-file
-RUN rm -f random-file
+# Run a command with random content to prevent Docker from caching the git clone step.
+RUN echo {{ now() }}
 RUN git clone https://github.com/fedora-infra/fasjson.git && \
     pushd fasjson && \
     git checkout {{ (env == 'production')|ternary('stable', 'staging') }} && \