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/matchers/be_identical_to.go

@@ -0,0 +1,37 @@
+package matchers
+
+import (
+	"fmt"
+	"runtime"
+
+	"github.com/onsi/gomega/format"
+)
+
+type BeIdenticalToMatcher struct {
+	Expected interface{}
+}
+
+func (matcher *BeIdenticalToMatcher) Match(actual interface{}) (success bool, matchErr error) {
+	if actual == nil && matcher.Expected == nil {
+		return false, fmt.Errorf("Refusing to compare <nil> to <nil>.\nBe explicit and use BeNil() instead.  This is to avoid mistakes where both sides of an assertion are erroneously uninitialized.")
+	}
+
+	defer func() {
+		if r := recover(); r != nil {
+			if _, ok := r.(runtime.Error); ok {
+				success = false
+				matchErr = nil
+			}
+		}
+	}()
+
+	return actual == matcher.Expected, nil
+}
+
+func (matcher *BeIdenticalToMatcher) FailureMessage(actual interface{}) string {
+	return format.Message(actual, "to be identical to", matcher.Expected)
+}
+
+func (matcher *BeIdenticalToMatcher) NegatedFailureMessage(actual interface{}) string {
+	return format.Message(actual, "not to be identical to", matcher.Expected)
+}