feat(container): add image build validation steps

vars/utils.groovy

@@ -0,0 +1,13 @@
+import org.jenkinsci.plugins.pipeline.modeldefinition.Utils
+
+void when(Boolean condition, body) {
+    Map config = [:]
+    body.resolveStrategy = Closure.OWNER_FIRST
+    body.delegate = config
+
+    if (condition) {
+        body()
+    } else {
+        Utils.markStageSkippedForConditional(STAGE_NAME)
+    }
+}