Remove usage of context.DeadlineExceeded

for internal decisions as this error is strongly used by other packages. By checking such wrapped errors the internal decision can be influenced accidentally.
In this case the retry mechanism checked if the error is context.DeadlineExceeded and assumed it would be created by the internal context. This assumption was wrong.

internal/environment/nomad_manager.go

@@ -3,7 +3,6 @@ package environment
 import (
 	"context"
 	_ "embed"
-	"errors"
 	"fmt"
 	nomadApi "github.com/hashicorp/nomad/api"
 	"github.com/hashicorp/nomad/nomad/structs"
@@ -14,6 +13,7 @@ import (
 	"github.com/openHPI/poseidon/pkg/monitoring"
 	"github.com/openHPI/poseidon/pkg/storage"
 	"github.com/openHPI/poseidon/pkg/util"
+	"github.com/sirupsen/logrus"
 	"math"
 	"os"
 	"time"
@@ -187,14 +187,17 @@ func (m *NomadEnvironmentManager) KeepEnvironmentsSynced(synchronizeRunners func
 
 		return nil
 	})
-	if err != nil && !(errors.Is(err, context.DeadlineExceeded) || errors.Is(err, context.Canceled)) {
-		log.WithContext(ctx).WithError(err).Fatal("Stopped KeepEnvironmentsSynced")
+	level := logrus.InfoLevel
+	if err != nil && ctx.Err() == nil {
+		level = logrus.FatalLevel
 	}
+	log.WithContext(ctx).WithError(err).Log(level, "Stopped KeepEnvironmentsSynced")
 }
 
 // Load recovers all environments from the Jobs in Nomad.
 // As it replaces the environments the idle runners stored are not tracked anymore.
 func (m *NomadEnvironmentManager) load() error {
+	log.Info("Loading environments")
 	// We have to destroy the environments first as otherwise they would just be replaced and old goroutines might stay running.
 	for _, environment := range m.runnerManager.ListEnvironments() {
 		err := environment.Delete(runner.ErrDestroyedAndReplaced)