Increase certmanager install timeout

We have been getting reports from users that the cluster
issuer is not ready prior to timing out, failing the
installation. Since this time is primarily spent on the
cluster and not in Sidekiq, we can probably afford to wait
a bit longer.

See e.g. https://gitlab.com/gitlab-org/gitlab/issues/33186

app/models/clusters/applications/cert_manager.rb

@@ -65,7 +65,7 @@ module Clusters
       end
 
       def retry_command(command)
-        "for i in $(seq 1 30); do #{command} && s=0 && break || s=$?; sleep 1s; echo \"Retrying ($i)...\"; done; (exit $s)"
+        "for i in $(seq 1 90); do #{command} && s=0 && break || s=$?; sleep 1s; echo \"Retrying ($i)...\"; done; (exit $s)"
       end
 
       def post_delete_script

changelogs/unreleased/increase-certmanager-install-timeout.yml

+---
+title: Increase the timeout for GitLab-managed cert-manager installation to 90 seconds
+  (was 30 seconds)
+merge_request: 19447
+author:
+type: fixed

spec/models/clusters/applications/cert_manager_spec.rb

@@ -54,7 +54,7 @@ describe Clusters::Applications::CertManager do
         'kubectl label --overwrite namespace gitlab-managed-apps certmanager.k8s.io/disable-validation=true'
       ])
       expect(subject.postinstall).to eq([
-        "for i in $(seq 1 30); do kubectl apply -f /data/helm/certmanager/config/cluster_issuer.yaml && s=0 && break || s=$?; sleep 1s; echo \"Retrying ($i)...\"; done; (exit $s)"
+        "for i in $(seq 1 90); do kubectl apply -f /data/helm/certmanager/config/cluster_issuer.yaml && s=0 && break || s=$?; sleep 1s; echo \"Retrying ($i)...\"; done; (exit $s)"
       ])
     end