Cirrus: add vendor_check_task

* Make sure that all vendored dependencies are in sync with the code and
  the vendor.conf by running `make vendor` with a follow-up status check
  of the git tree.

* Vendor ginkgo and gomega to include the test dependencies.

Signed-off-by: Chris Evic <cevich@redhat.com>
Signed-off-by: Valentin Rothberg <rothberg@redhat.com>

vendor/github.com/onsi/gomega/gstruct/ignore.go

@@ -0,0 +1,37 @@
+package gstruct
+
+import (
+	"github.com/onsi/gomega/types"
+)
+
+//Ignore ignores the actual value and always succeeds.
+//  Expect(nil).To(Ignore())
+//  Expect(true).To(Ignore())
+func Ignore() types.GomegaMatcher {
+	return &IgnoreMatcher{true}
+}
+
+//Reject ignores the actual value and always fails. It can be used in conjunction with IgnoreMissing
+//to catch problematic elements, or to verify tests are running.
+//  Expect(nil).NotTo(Reject())
+//  Expect(true).NotTo(Reject())
+func Reject() types.GomegaMatcher {
+	return &IgnoreMatcher{false}
+}
+
+// A matcher that either always succeeds or always fails.
+type IgnoreMatcher struct {
+	Succeed bool
+}
+
+func (m *IgnoreMatcher) Match(actual interface{}) (bool, error) {
+	return m.Succeed, nil
+}
+
+func (m *IgnoreMatcher) FailureMessage(_ interface{}) (message string) {
+	return "Unconditional failure"
+}
+
+func (m *IgnoreMatcher) NegatedFailureMessage(_ interface{}) (message string) {
+	return "Unconditional success"
+}