chore(tests): AzureKeyVaultKmsTestKmsFacadeTest is missing its docker precondition (kroxylicious#3530)

why: our intention is the the test suite runs cleanly, even if external dependencies such as docker are not available.
we are missing the precondition in this case

Signed-off-by: Keith Wall <kwall@apache.org>

Author: k-wall

kroxylicious-kms-providers/kroxylicious-kms-provider-azure-key-vault-kms-test-support/src/test/java/io/kroxylicious/kms/provider/azure/kms/AzureKeyVaultKmsTestKmsFacadeTest.java

@@ -7,11 +7,14 @@
 package io.kroxylicious.kms.provider.azure.kms;
 
 import org.junit.jupiter.api.Test;
+import org.junit.jupiter.api.condition.EnabledIf;
+import org.testcontainers.DockerClientFactory;
 
 import com.github.nagyesta.lowkeyvault.testcontainers.LowkeyVaultContainer;
 
 import static org.assertj.core.api.Assertions.assertThat;
 
+@EnabledIf(value = "isDockerAvailable", disabledReason = "docker unavailable")
 class AzureKeyVaultKmsTestKmsFacadeTest {
 
     @Test
@@ -21,4 +24,7 @@ void lowKeyContainer() {
         }
     }
 
+    static boolean isDockerAvailable() {
+        return DockerClientFactory.instance().isDockerAvailable();
+    }
 }