Revert to old creds provisioning style

Change-Id: Ifc3ca264ed3d091e77a033ad18ccd2dc7ed0d67c
diff --git a/playbooks/setup-juju-client/pre.yaml b/playbooks/setup-juju-client/pre.yaml
index fe59758..de3a0c4 100644
--- a/playbooks/setup-juju-client/pre.yaml
+++ b/playbooks/setup-juju-client/pre.yaml
@@ -8,6 +8,7 @@
   - name: Log In to the Controller
     no_log: true
     block:
+
       - name: Log in
         ansible.builtin.shell: juju login 10.40.2.2:17070 --controller maas-controller --user zuul-nodepool-zaza
         args:
@@ -18,11 +19,13 @@
         args:
           stdin: "{{ juju_secret['the_secret'] }}\n"
 
-      - name: Grab the Ansible credentials
-        ansible.builtin.shell: juju credentials --controller maas-controller --format yaml --show-secrets
-        register: juju_credentials_full
+      - name: Prepare Juju credentials file
+        ansible.builtin.shell: umask 177 && echo "credentials:" > ~/.local/share/juju/credentials.yaml
+        args:
+          executable: /usr/bin/bash
 
-      - name: Store them into a file
-        ansible.builtin.copy:
-          dest: /home/ubuntu/.local/share/juju/credentials.yaml
-          content: "credentials:\n{{ juju_credentials_full.stdout_lines[1:] | join('\n') }}\n"
+      - name: Grab the Juju credentials and store them in a file
+        ansible.builtin.shell: juju credentials --controller maas-controller --format yaml --show-secrets | tail -n +2 >> ~/.local/share/juju/credentials.yaml
+        args:
+          executable: /usr/bin/bash
+