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.

Makefile

@@ -66,6 +66,17 @@ test: manifests generate fmt vet envtest ## Run tests.
 build: manifests generate fmt vet ## Build manager binary.
 	go build -o bin/manager main.go
 
+.PHONY: build-plugin
+build-plugin: fmt vet ## Build kubectl-managedjob plugin binary.
+	go build -o bin/kubectl-managedjob ./cmd/kubectl-managedjob
+
+.PHONY: install-plugin
+install-plugin: build-plugin ## Install kubectl-managedjob plugin to GOPATH/bin.
+	cp bin/kubectl-managedjob $(GOBIN)/kubectl-managedjob
+
+.PHONY: build-all
+build-all: build build-plugin ## Build both manager and plugin binaries.
+
 .PHONY: run
 run: manifests generate fmt vet ## Run a controller from your host.
 	go run ./main.go
@@ -139,7 +150,7 @@ ENVTEST ?= $(LOCALBIN)/setup-envtest
 
 ## Tool Versions
 KUSTOMIZE_VERSION ?= v3.8.7
-CONTROLLER_TOOLS_VERSION ?= v0.11.1
+CONTROLLER_TOOLS_VERSION ?= v0.17.1
 
 KUSTOMIZE_INSTALL_SCRIPT ?= "https://raw.githubusercontent.com/kubernetes-sigs/kustomize/master/hack/install_kustomize.sh"
 .PHONY: kustomize