fix: route CNB images through launcher on scheduler-k3s

Mirror the docker-local fix in #8525 for the k3s scheduler. CNB images default to a `/cnb/process/web` entrypoint that ignores incoming args, so non-web deployments, scheduled cron jobs, and ad-hoc `dokku run` / `cron:run` commands all need an explicit `launcher` entrypoint. The deployment and cron-job helm templates now set `command: [launcher]` when `image.type` is `pack`, and `TriggerSchedulerRun` sets the entrypoint to `launcher` for pack images while finishing the previously stubbed Procfile lookup branch so the resolved command is actually scheduled.

plugins/scheduler-k3s/templates/chart/cron-job.yaml

@@ -75,6 +75,10 @@ spec:
             {{- range $config.args }}
             - {{ . }}
             {{- end }}
+            {{- if eq $.Values.global.image.type "pack" }}
+            command:
+            - launcher
+            {{- end }}
             envFrom:
             - secretRef:
                 name: config-{{ $.Values.global.app_name }}

plugins/scheduler-k3s/templates/chart/deployment.yaml

@@ -63,6 +63,10 @@ spec:
         {{- range $config.args }}
         - {{ . }}
         {{- end }}
+        {{- if and (eq $.Values.global.image.type "pack") $config.args }}
+        command:
+        - launcher
+        {{- end }}
         {{- if hasKey $config "web" }}
         env:
         - name: PORT

plugins/scheduler-k3s/triggers.go

@@ -1409,16 +1409,22 @@ func TriggerSchedulerRun(scheduler string, appName string, envCount int, args []
 			Trigger: "procfile-get-command",
 			Args:    []string{appName, args[0], "5000"},
 		})
-		if err == nil && resp.Stdout != "" {
+		if err == nil && resp.StdoutContents() != "" {
 			common.LogInfo1Quiet(fmt.Sprintf("Found '%s' in Procfile, running that command", args[0]))
-			return err
+			words, err := shellquote.Split(resp.StdoutContents())
+			if err != nil {
+				return fmt.Errorf("Error parsing Procfile command: %w", err)
+			}
+			command = words
 		}
-		// todo: run command in procfile
 	}
 
 	entrypoint := ""
-	if imageSourceType == "herokuish" {
+	switch imageSourceType {
+	case "herokuish":
 		entrypoint = "/exec"
+	case "pack":
+		entrypoint = "launcher"
 	}
 
 	helmAgent, err := NewHelmAgent(namespace, DevNullPrinter)
@@ -1482,7 +1488,7 @@ func TriggerSchedulerRun(scheduler string, appName string, envCount int, args []
 	workingDir := common.GetWorkingDir(appName, image)
 	job, err := templateKubernetesJob(Job{
 		AppName:               appName,
-		Command:               []string{commandShell},
+		Command:               command,
 		DeploymentID:          deploymentID,
 		Entrypoint:            entrypoint,
 		Env:                   extraEnv,