Add addional patcher to make it possible to set matchlabels

theodolite/src/main/kotlin/theodolite/patcher/MatchLabelPatcher.kt

+package theodolite.patcher
+
+import io.fabric8.kubernetes.api.model.KubernetesResource
+import io.fabric8.kubernetes.api.model.apps.Deployment
+import io.fabric8.kubernetes.api.model.apps.StatefulSet
+
+class MatchLabelPatcher(private val k8sResource: KubernetesResource, val variableName: String) :
+    AbstractPatcher(k8sResource) {
+
+    override fun <String> patch(labelValue: String) {
+        if (labelValue is kotlin.String) {
+            when (k8sResource) {
+                is Deployment -> {
+                    if (k8sResource.spec.selector.matchLabels == null) {
+                        k8sResource.spec.selector.matchLabels = mutableMapOf()
+                    }
+                    k8sResource.spec.selector.matchLabels[this.variableName] = labelValue
+                }
+                is StatefulSet -> {
+                    if (k8sResource.spec.selector.matchLabels == null) {
+                        k8sResource.spec.selector.matchLabels = mutableMapOf()
+                    }
+                    k8sResource.spec.selector.matchLabels[this.variableName] = labelValue
+                }
+            }
+        }
+    }
+}
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