playbooks: Reduce flakiness due to network errors when pulling images

This change adds a pre-run task to pull the fedora-toolbox images from
the registry to reduce the number of false positives caused by
'podman pull' failing to download them during the actual test.

Each section needs a separate playbook because they use different
versions of Fedora, and hence different default images.

#375

playbooks/fedora-30/pre-common.yaml

@@ -0,0 +1,13 @@
+- name: Pull registry.fedoraproject.org/f30/fedora-toolbox:30
+  command: podman pull registry.fedoraproject.org/f30/fedora-toolbox:30
+  register: _podman
+  until: _podman.rc == 0
+  retries: 5
+  delay: 10
+
+- name: Pull registry.fedoraproject.org/f29/fedora-toolbox:29
+  command: podman pull registry.fedoraproject.org/f29/fedora-toolbox:29
+  register: _podman
+  until: _podman.rc == 0
+  retries: 5
+  delay: 10

playbooks/fedora-30/setup-rpm-env.yaml

@@ -20,3 +20,5 @@
 
     - name: Check versions of crucial packages
       command: rpm -q podman runc conmon fuse-overlayfs flatpak-session-helper
+
+    - include_tasks: ./pre-common.yaml

playbooks/fedora-31/pre-common.yaml

@@ -0,0 +1,13 @@
+- name: Pull registry.fedoraproject.org/f31/fedora-toolbox:31
+  command: podman pull registry.fedoraproject.org/f31/fedora-toolbox:31
+  register: _podman
+  until: _podman.rc == 0
+  retries: 5
+  delay: 10
+
+- name: Pull registry.fedoraproject.org/f29/fedora-toolbox:29
+  command: podman pull registry.fedoraproject.org/f29/fedora-toolbox:29
+  register: _podman
+  until: _podman.rc == 0
+  retries: 5
+  delay: 10

playbooks/fedora-31/setup-rpm-env.yaml

@@ -20,3 +20,5 @@
 
     - name: Check versions of crucial packages
       command: rpm -q podman crun conmon fuse-overlayfs flatpak-session-helper
+
+    - include_tasks: ./pre-common.yaml

playbooks/fedora-rawhide/pre-common.yaml

@@ -0,0 +1,13 @@
+- name: Pull registry.fedoraproject.org/f32/fedora-toolbox:32
+  command: podman pull registry.fedoraproject.org/f32/fedora-toolbox:32
+  register: _podman
+  until: _podman.rc == 0
+  retries: 5
+  delay: 10
+
+- name: Pull registry.fedoraproject.org/f29/fedora-toolbox:29
+  command: podman pull registry.fedoraproject.org/f29/fedora-toolbox:29
+  register: _podman
+  until: _podman.rc == 0
+  retries: 5
+  delay: 10

playbooks/fedora-rawhide/setup-rpm-env.yaml

@@ -21,3 +21,5 @@
 
     - name: Check versions of crucial packages
       command: rpm -q podman crun conmon fuse-overlayfs flatpak-session-helper
+
+    - include_tasks: ./pre-common.yaml