Cincinnati: mount credentials secret in e2e test container

Required to use github token in e2e runs, see openshift/cincinnati#233

ci-operator/config/openshift/cincinnati/openshift-cincinnati-master.yaml

@@ -73,3 +73,6 @@ tests:
   openshift_installer_custom_test_image:
     cluster_profile: aws
     from: pipeline:e2e-test
+  secret:
+    mount_path: /tmp/shared/cincinnati-credentials
+    name: cincinnati-secrets-cincinnati-credentials

ci-operator/jobs/openshift/cincinnati/openshift-cincinnati-master-presubmits.yaml

@@ -99,6 +99,7 @@ presubmits:
         - --org=openshift
         - --repo=cincinnati
         - --resolver-address=http://ci-operator-configresolver-ci.svc.ci.openshift.org
+        - --secret-dir=/tmp/shared/cincinnati-credentials
         - --secret-dir=/usr/local/e2e-cluster-profile
         - --sentry-dsn-path=/etc/sentry-dsn/ci-operator
         - --target=e2e
@@ -132,6 +133,9 @@ presubmits:
         - mountPath: /etc/boskos
           name: boskos
           readOnly: true
+        - mountPath: /tmp/shared/cincinnati-credentials
+          name: cincinnati-secrets-cincinnati-credentials
+          readOnly: true
         - mountPath: /usr/local/e2e-cluster-profile
           name: cluster-profile
         - mountPath: /usr/local/e2e
@@ -157,6 +161,9 @@ presubmits:
           - key: password
             path: password
           secretName: boskos-credentials
+      - name: cincinnati-secrets-cincinnati-credentials
+        secret:
+          secretName: cincinnati-secrets-cincinnati-credentials
       - name: cluster-profile
         projected:
           sources: