Multiple fixes (#29)

* Multiple fixes

- add goreleaser to the build / release process
- add kubectl plugin for job graphs visualization
- add installation scripts
- update dependencies

* Update the release & CRD content.

* Next set of improvements.

  Code Quality

  - Label constants: Added LabelWorkflowName, LabelGroupName, LabelJobName, LabelJobID in controllers/definitions.go
  - Removed commented debug code: Cleaned up dead code from multiple files
  - Removed unused dependencyTree field: Cleaned connPackage struct
  - Fixed snake_case variables: Changed to camelCase (runGroup, groupDep, runJob, jobDep, k8sJob)

  Kubernetes Best Practices

  - Finalizers: Implemented handleDeletion() and deleteChildJobs() for proper cleanup
  - Status enum validation: Added +kubebuilder:validation:Enum=pending;running;succeeded;failed;aborted
  - ImagePullPolicy default: Created getImagePullPolicy() helper that defaults to IfNotPresent
  - Resource limits support: Added Resources *corev1.ResourceRequirements to ManagedJobParameters

  Observability

  - Prometheus metrics: Created controllers/metrics.go with counters (jobs created/succeeded/failed), histogram (reconciliation duration), and gauge (active jobs)
  - Structured logging: Added logger field to connPackage, used context-based logging throughout

  Configuration

  - Leader election ID: Made configurable via --leader-election-id flag
  - Development mode: Made configurable via --dev-mode flag and LOG_LEVEL env var

  Performance

  - Dependency lookup optimization: Changed from O(n*m) to O(1) using lookup maps (jobDepMap, groupDepMap)
  - Reconciliation backoff: Added RequeueAfter: 30*time.Second when workflow is running

  Documentation & Testing

  - Godoc documentation: Added comprehensive comments to API types and controller
  - Unit tests: Added helpers_test.go with tests for all helper functions
  - Integration tests: Added managedjob_controller_test.go with Ginkgo/Gomega tests

* Add the helm chart release.

* Add reasonable test coverage.

main.go

@@ -53,17 +53,31 @@ func main() {
 	var metricsAddr string
 	var enableLeaderElection bool
 	var probeAddr string
+	var leaderElectionID string
+	var devMode bool
+
 	flag.StringVar(&metricsAddr, "metrics-bind-address", ":8080", "The address the metric endpoint binds to.")
 	flag.StringVar(&probeAddr, "health-probe-bind-address", ":8081", "The address the probe endpoint binds to.")
 	flag.BoolVar(&enableLeaderElection, "leader-elect", false,
 		"Enable leader election for controller manager. "+
 			"Enabling this will ensure there is only one active controller manager.")
+	flag.StringVar(&leaderElectionID, "leader-election-id", "jobsmanager.raczylo.com",
+		"The name of the leader election resource.")
+	flag.BoolVar(&devMode, "dev-mode", false,
+		"Enable development mode with verbose logging (console format).")
+
 	opts := zap.Options{
-		Development: true,
+		Development: devMode,
 	}
 	opts.BindFlags(flag.CommandLine)
 	flag.Parse()
 
+	// Allow environment variable to override dev mode
+	if os.Getenv("LOG_LEVEL") == "debug" {
+		devMode = true
+		opts.Development = true
+	}
+
 	ctrl.SetLogger(zap.New(zap.UseFlagOptions(&opts)))
 
 	mgr, err := ctrl.NewManager(ctrl.GetConfigOrDie(), ctrl.Options{
@@ -74,7 +88,7 @@ func main() {
 		// Port:                   9443,
 		HealthProbeBindAddress: probeAddr,
 		LeaderElection:         enableLeaderElection,
-		LeaderElectionID:       "b86e0f00.raczylo.com",
+		LeaderElectionID:       leaderElectionID,
 		// LeaderElectionReleaseOnCancel defines if the leader should step down voluntarily
 		// when the Manager ends. This requires the binary to immediately end when the
 		// Manager is stopped, otherwise, this setting is unsafe. Setting this significantly