ci: skip commitlint for dependabot PRs

Dependabot creates commit messages that commitlint fails to parse
correctly. The messages contain simple references to which dependencies
are updated, and do not need full validation like manual written
messages do.

Signed-off-by: Niels de Vos <ndevos@redhat.com>

.mergify.yml

@@ -32,6 +32,35 @@ pull_request_rules:
         message: "This pull request now has conflicts with the target branch.
         Could you please resolve conflicts and force push the corrected
         changes? 🙏"
+  - name: update dependencies by dependabot (skip commitlint)
+    conditions:
+      - author=dependabot[bot]
+      - label!=DNM
+      - base~=^(devel)|(release-.+)$
+      - "#approved-reviews-by>=2"
+      - "#changes-requested-reviews-by=0"
+      - "approved-reviews-by=@ceph/ceph-csi-contributors"
+      - "approved-reviews-by=@ceph/ceph-csi-maintainers"
+      - "status-success=codespell"
+      - "status-success=multi-arch-build"
+      - "status-success=go-test"
+      - "status-success=golangci-lint"
+      - "status-success=gosec"
+      - "status-success=mod-check"
+      - "status-success=lint-extras"
+      - "status-success=ci/centos/mini-e2e-helm/k8s-1.20"
+      - "status-success=ci/centos/mini-e2e-helm/k8s-1.21"
+      - "status-success=ci/centos/mini-e2e-helm/k8s-1.22"
+      - "status-success=ci/centos/mini-e2e/k8s-1.20"
+      - "status-success=ci/centos/mini-e2e/k8s-1.21"
+      - "status-success=ci/centos/mini-e2e/k8s-1.22"
+      - "status-success=ci/centos/upgrade-tests-cephfs"
+      - "status-success=ci/centos/upgrade-tests-rbd"
+      - "status-success=DCO"
+    actions:
+      merge: {}
+      dismiss_reviews: {}
+      delete_head_branch: {}
   - name: automatic merge
     conditions:
       - label!=DNM