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.

pkg/visualization/tree.go

@@ -0,0 +1,54 @@
+package visualization
+
+// StatusTree represents a tree node with text and execution status
+type StatusTree struct {
+	text   string
+	status string
+	items  []*StatusTree
+}
+
+// NewStatusTree creates a new StatusTree node
+func NewStatusTree(text string) *StatusTree {
+	return &StatusTree{
+		text:  text,
+		items: make([]*StatusTree, 0),
+	}
+}
+
+// NewStatusTreeWithStatus creates a new StatusTree node with a status
+func NewStatusTreeWithStatus(text, status string) *StatusTree {
+	return &StatusTree{
+		text:   text,
+		status: status,
+		items:  make([]*StatusTree, 0),
+	}
+}
+
+// Add creates and appends a child node, returning it for chaining
+func (t *StatusTree) Add(text string) *StatusTree {
+	child := NewStatusTree(text)
+	t.items = append(t.items, child)
+	return child
+}
+
+// AddWithStatus creates and appends a child node with status
+func (t *StatusTree) AddWithStatus(text, status string) *StatusTree {
+	child := NewStatusTreeWithStatus(text, status)
+	t.items = append(t.items, child)
+	return child
+}
+
+// Items returns all child nodes
+func (t *StatusTree) Items() []*StatusTree {
+	return t.items
+}
+
+// Text returns the node's text value
+func (t *StatusTree) Text() string {
+	return t.text
+}
+
+// Status returns the node's status value
+func (t *StatusTree) Status() string {
+	return t.status
+}