feat: Add Pod Labels as a configurable option (#1115)

Author: liam-mackie

source/Octopus.Tentacle/Kubernetes/KubernetesConfig.cs

@@ -68,6 +68,9 @@ public static class KubernetesConfig
         public static readonly string PodAnnotationsJsonVariableName = $"{EnvVarPrefix}__PODANNOTATIONSJSON";
         public static string? PodAnnotationsJson => Environment.GetEnvironmentVariable(PodAnnotationsJsonVariableName);
 
+        public static readonly string PodLabelsJsonVariableName = $"{EnvVarPrefix}__PODLABELSJSON";
+        public static string? PodLabelsJson => Environment.GetEnvironmentVariable(PodLabelsJsonVariableName);
+        
         public static readonly string TentacleConfigMapNameVariableName = $"{EnvVarPrefix}__TENTACLECONFIGMAPNAME";
         public static string TentacleConfigMapName => GetEnvironmentVariableOrDefault(TentacleConfigMapNameVariableName, "tentacle-config");
 

source/Octopus.Tentacle/Kubernetes/KubernetesScriptPodCreator.cs

@@ -199,11 +199,7 @@ async Task CreatePod(StartKubernetesScriptCommandV1 command, IScriptWorkspace wo
                 {
                     Name = podName,
                     NamespaceProperty = KubernetesConfig.Namespace,
-                    Labels = new Dictionary<string, string>
-                    {
-                        ["octopus.com/serverTaskId"] = command.TaskId,
-                        ["octopus.com/scriptTicketId"] = command.ScriptTicket.TaskId
-                    },
+                    Labels = GetScriptPodLabels(tentacleScriptLog, command),
                     Annotations = ParseScriptPodAnnotations(tentacleScriptLog)
                 },
                 Spec = new V1PodSpec
@@ -419,6 +415,29 @@ V1Affinity ParseScriptPodAffinity(InMemoryTentacleScriptLog tentacleScriptLog)
                 KubernetesConfig.PodAnnotationsJsonVariableName,
                 "pod annotations");
 
+        Dictionary<string, string>? GetScriptPodLabels(InMemoryTentacleScriptLog tentacleScriptLog, StartKubernetesScriptCommandV1 command)
+        {
+            var labels = new Dictionary<string, string>
+            {
+                ["octopus.com/serverTaskId"] = command.TaskId,
+                ["octopus.com/scriptTicketId"] = command.ScriptTicket.TaskId
+            };
+            var extraLabels = ParseScriptPodJson<Dictionary<string, string>>(
+                tentacleScriptLog,
+                KubernetesConfig.PodLabelsJson,
+                KubernetesConfig.PodLabelsJsonVariableName,
+                "pod labels");
+
+            if (extraLabels != null)
+            {
+                labels.AddRange(extraLabels);
+            }            
+            
+            return labels;
+        }
+
+        
+
         [return: NotNullIfNotNull("defaultValue")]
         T? ParseScriptPodJson<T>(InMemoryTentacleScriptLog tentacleScriptLog, string? json, string envVarName, string description, T? defaultValue = null) where T : class
         {