fix(kubernetes): consider workload not ready when scaled to 0 (#543)

* test(kubernetes): use testcontainers for test

* fix(kubernetes): get state properly reports the workload as down when scaled to 0

* refactor(kubernetes): split provider in multiple files

* refactor(provider): use Instance prefix for actions

* test(testcontainers): use provider.PullImage

* squash

* Revert "test(testcontainers): use provider.PullImage"

This reverts commit 6f958c48a5.

* test: add random generator thread safety

pkg/provider/kubernetes/deployment_list.go

@@ -0,0 +1,49 @@
+package kubernetes
+
+import (
+	"context"
+	"github.com/sablierapp/sablier/app/discovery"
+	"github.com/sablierapp/sablier/app/types"
+	"github.com/sablierapp/sablier/pkg/provider"
+	v1 "k8s.io/api/apps/v1"
+	core_v1 "k8s.io/api/core/v1"
+	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
+	"strings"
+)
+
+func (p *KubernetesProvider) DeploymentList(ctx context.Context, options provider.InstanceListOptions) ([]types.Instance, error) {
+	deployments, err := p.Client.AppsV1().Deployments(core_v1.NamespaceAll).List(ctx, metav1.ListOptions{
+		LabelSelector: strings.Join(options.Labels, ","),
+	})
+
+	if err != nil {
+		return nil, err
+	}
+
+	instances := make([]types.Instance, 0, len(deployments.Items))
+	for _, d := range deployments.Items {
+		instance := p.deploymentToInstance(&d)
+		instances = append(instances, instance)
+	}
+
+	return instances, nil
+}
+
+func (p *KubernetesProvider) deploymentToInstance(d *v1.Deployment) types.Instance {
+	var group string
+
+	if _, ok := d.Labels[discovery.LabelEnable]; ok {
+		if g, ok := d.Labels[discovery.LabelGroup]; ok {
+			group = g
+		} else {
+			group = discovery.LabelGroupDefaultValue
+		}
+	}
+
+	parsed := DeploymentName(d, ParseOptions{Delimiter: p.delimiter})
+
+	return types.Instance{
+		Name:  parsed.Original,
+		Group: group,
+	}
+}