fix: can't run multiple services on k8s (#3395)

Fix Issue: https://github.com/woodpecker-ci/woodpecker/issues/3288

The way the pod service starts up makes it impossible to run two or more
pipelines at the same time when we have a service section.

The idea is to set the name of the service in the same way we did for
the pod name.

Pipeline: 

```yaml

services:
  mydb:
    image: mysql
    environment:
      - MYSQL_DATABASE=test
      - MYSQL_ROOT_PASSWORD=example
    ports:
      - 3306/tcp
steps:
  get-version:
    image: ubuntu
    commands:
      - ( apt update && apt dist-upgrade -y && apt install -y mysql-client 2>&1 )> /dev/null
      - sleep 30s # need to wait for mysql-server init
      - echo 'SHOW VARIABLES LIKE "version"' | mysql -uroot -hmydb test -pexample
```

Running more than one pipeline result:


![image](https://github.com/woodpecker-ci/woodpecker/assets/22245125/e512309f-0d1e-4125-bab9-2357a710fedd)

---------

Co-authored-by: elias.souza <elias.souza@quintoandar.com.br>

pipeline/backend/kubernetes/pod.go

@@ -90,7 +90,7 @@ func podMeta(step *types.Step, config *config, options BackendOptions, podName s
 	}
 
 	if step.Type == types.StepTypeService {
-		meta.Labels[ServiceLabel] = step.Name
+		meta.Labels[ServiceLabel], _ = serviceName(step)
 	}
 
 	meta.Annotations = config.PodAnnotations

pipeline/backend/kubernetes/pod_test.go

@@ -51,7 +51,7 @@ func TestStepToPodName(t *testing.T) {
 	assert.EqualValues(t, "wp-01he8bebctabr3kg", name)
 	name, err = stepToPodName(&types.Step{UUID: "01he8bebctabr3kg", Name: "postgres", Type: types.StepTypeService})
 	assert.NoError(t, err)
-	assert.EqualValues(t, "postgres", name)
+	assert.EqualValues(t, "wp-svc-01he8bebctabr3kg-postgres", name)
 }
 
 func TestStepLabel(t *testing.T) {

pipeline/backend/kubernetes/service.go

@@ -30,6 +30,7 @@ import (
 
 const (
 	ServiceLabel  = "service"
+	servicePrefix = "wp-svc-"
 )
 
 func mkService(step *types.Step, config *config) (*v1.Service, error) {
@@ -62,7 +63,7 @@ func mkService(step *types.Step, config *config) (*v1.Service, error) {
 }
 
 func serviceName(step *types.Step) (string, error) {
-	return dnsName(step.Name)
+	return dnsName(servicePrefix + step.UUID + "-" + step.Name)
 }
 
 func servicePort(port types.Port) v1.ServicePort {

pipeline/backend/kubernetes/service_test.go

@@ -24,24 +24,24 @@ import (
 )
 
 func TestServiceName(t *testing.T) {
-	name, err := serviceName(&types.Step{Name: "database"})
+	name, err := serviceName(&types.Step{Name: "database", UUID: "01he8bebctabr3kgk0qj36d2me"})
 	assert.NoError(t, err)
-	assert.Equal(t, "database", name)
+	assert.Equal(t, "wp-svc-01he8bebctabr3kgk0qj36d2me-database", name)
 
-	name, err = serviceName(&types.Step{Name: "wp-01he8bebctabr3kgk0qj36d2me-0-services-0.woodpecker-runtime.svc.cluster.local"})
+	name, err = serviceName(&types.Step{Name: "wp-01he8bebctabr3kgk0qj36d2me-0-services-0.woodpecker-runtime.svc.cluster.local", UUID: "01he8bebctabr3kgk0qj36d2me"})
 	assert.NoError(t, err)
-	assert.Equal(t, "wp-01he8bebctabr3kgk0qj36d2me-0-services-0.woodpecker-runtime.svc.cluster.local", name)
+	assert.Equal(t, "wp-svc-01he8bebctabr3kgk0qj36d2me-wp-01he8bebctabr3kgk0qj36d2me-0-services-0.woodpecker-runtime.svc.cluster.local", name)
 
-	name, err = serviceName(&types.Step{Name: "awesome_service"})
+	name, err = serviceName(&types.Step{Name: "awesome_service", UUID: "01he8bebctabr3kgk0qj36d2me"})
 	assert.NoError(t, err)
-	assert.Equal(t, "awesome-service", name)
+	assert.Equal(t, "wp-svc-01he8bebctabr3kgk0qj36d2me-awesome-service", name)
 }
 
 func TestService(t *testing.T) {
 	expected := `
 	{
 	  "metadata": {
-	    "name": "bar",
+	    "name": "wp-svc-01he8bebctabr3kgk0qj36d2me-0-bar",
 	    "namespace": "foo",
 	    "creationTimestamp": null
 	  },
@@ -66,7 +66,7 @@ func TestService(t *testing.T) {
 	      }
 	    ],
 	    "selector": {
-	      "service": "bar"
+	      "service": "wp-svc-01he8bebctabr3kgk0qj36d2me-0-bar"
 	    },
 	    "type": "ClusterIP"
 	  },
@@ -81,6 +81,7 @@ func TestService(t *testing.T) {
 	}
 	s, err := mkService(&types.Step{
 		Name:  "bar",
+		UUID:  "01he8bebctabr3kgk0qj36d2me-0",
 		Ports: ports,
 	}, &config{Namespace: "foo"})
 	assert.NoError(t, err)