fedora-container: update to Fedora 35

Support Fedora 35 in this element, and update the default

Depends-On: https://review.opendev.org/c/zuul/nodepool/+/815766
Change-Id: I2a9a8648158e1e4b1a071e20266fb8d125da67ac

.zuul.d/jobs.yaml

@@ -113,7 +113,7 @@
         # mirror: "http://{{ zuul_site_mirror_fqdn }}/centos"
 
 - job:
-    name: dib-nodepool-functional-openstack-fedora-34-containerfile-src
+    name: dib-nodepool-functional-openstack-fedora-35-containerfile-src
     description: |
       Test building and booting an Fedora image from a
       containerfile with Nodepool and OpenStack (using released
@@ -124,7 +124,7 @@
       nodepool_debug: true
       nodepool_diskimage:
         base_element: fedora-container
-        release: '34'
+        release: '35'
 
 - job:
     name: dib-nodepool-functional-openstack-ubuntu-xenial-src

.zuul.d/project.yaml

@@ -18,7 +18,7 @@
         - dib-nodepool-functional-openstack-centos-8-src
         - dib-nodepool-functional-openstack-centos-8-stream-src
         - dib-nodepool-functional-openstack-centos-9-stream-src
-        - dib-nodepool-functional-openstack-fedora-34-containerfile-src
+        - dib-nodepool-functional-openstack-fedora-35-containerfile-src
         - dib-nodepool-functional-openstack-ubuntu-xenial-src
         - dib-nodepool-functional-openstack-ubuntu-bionic-src
         - dib-nodepool-functional-openstack-ubuntu-focal-src
@@ -48,7 +48,7 @@
         - dib-nodepool-functional-openstack-centos-8-src
         - dib-nodepool-functional-openstack-centos-8-stream-src
         - dib-nodepool-functional-openstack-centos-9-stream-src
-        - dib-nodepool-functional-openstack-fedora-34-containerfile-src
+        - dib-nodepool-functional-openstack-fedora-35-containerfile-src
         - dib-nodepool-functional-openstack-ubuntu-xenial-src
         - dib-nodepool-functional-openstack-ubuntu-bionic-src
         - dib-nodepool-functional-openstack-ubuntu-focal-src

diskimage_builder/elements/fedora-container/containerfiles/35

@@ -0,0 +1,3 @@
+FROM docker.io/library/fedora:35
+
+RUN dnf install -y findutils util-linux