[fix] Race in workflow engine (#13879)

* [fix] Fix race in workflow engine

* Remove unused mutex

core/services/workflows/engine.go

@@ -333,7 +333,7 @@ func (e *Engine) registerTrigger(ctx context.Context, t *triggerCapability, trig
 		return err
 	}
 
-	t.config = tc
+	t.config.Store(tc)
 
 	triggerRegRequest := capabilities.CapabilityRequest{
 		Metadata: capabilities.RequestMetadata{
@@ -343,7 +343,7 @@ func (e *Engine) registerTrigger(ctx context.Context, t *triggerCapability, trig
 			WorkflowName:             e.workflow.name,
 			WorkflowOwner:            e.workflow.owner,
 		},
-		Config: tc,
+		Config: t.config.Load(),
 		Inputs: triggerInputs,
 	}
 	eventsCh, err := t.trigger.RegisterTrigger(ctx, triggerRegRequest)
@@ -788,7 +788,7 @@ func (e *Engine) deregisterTrigger(ctx context.Context, t *triggerCapability, tr
 			WorkflowOwner:            e.workflow.owner,
 		},
 		Inputs: triggerInputs,
-		Config: t.config,
+		Config: t.config.Load(),
 	}
 
 	// if t.trigger == nil, then we haven't initialized the workflow

core/services/workflows/models.go

@@ -3,6 +3,7 @@ package workflows
 import (
 	"errors"
 	"fmt"
+	"sync/atomic"
 
 	"github.com/dominikbraun/graph"
 
@@ -86,7 +87,8 @@ type step struct {
 type triggerCapability struct {
 	workflows.StepDefinition
 	trigger capabilities.TriggerCapability
-	config  *values.Map
+
+	config atomic.Pointer[values.Map]
 }
 
 func Parse(yamlWorkflow string) (*workflow, error) {