fix unlock for gcp (#110)

* print error if unlock failed

* report more error messages

* merge main into branch

Author: motatoes

pkg/digger/digger.go

@@ -263,17 +263,23 @@ func (d DiggerExecutor) Apply(prNumber int) {
 		d.prManager.PublishComment(prNumber, comment)
 		if err == nil {
 			_, err := d.lock.Unlock(d.LockId(), prNumber)
-			fmt.Errorf("error unlocking project: %v", err)
+			if err != nil {
+				fmt.Errorf("error unlocking project: %v", err)
+			}
 		} else {
+			
 			d.prManager.PublishComment(prNumber, "Error during applying. Project lock will persist")
 		}
 	}
 
 }
 
 func (d DiggerExecutor) Unlock(prNumber int) {
-	d.lock.ForceUnlock(d.LockId(), prNumber)
-
+	err := d.lock.ForceUnlock(d.LockId(), prNumber)
+	if err != nil {
+		fmt.Printf("%v\n", err)
+		os.Exit(1)
+	}
 }
 
 func (d DiggerExecutor) Lock(prNumber int) bool {

pkg/utils/locking.go

@@ -36,7 +36,7 @@ type Lock interface {
 type ProjectLock interface {
 	Lock(lockId string, prNumber int) (bool, error)
 	Unlock(lockId string, prNumber int) (bool, error)
-	ForceUnlock(lockId string, prNumber int)
+	ForceUnlock(lockId string, prNumber int) error
 }
 
 func (projectLock *ProjectLockImpl) Lock(lockId string, prNumber int) (bool, error) {
@@ -104,18 +104,26 @@ func (projectLock *ProjectLockImpl) Unlock(lockId string, prNumber int) (bool, e
 	return false, nil
 }
 
-func (projectLock *ProjectLockImpl) ForceUnlock(lockId string, prNumber int) {
+func (projectLock *ProjectLockImpl) ForceUnlock(lockId string, prNumber int) error {
 	fmt.Printf("ForceUnlock %s\n", lockId)
-	lock, _ := projectLock.InternalLock.GetLock(lockId)
+	lock, err := projectLock.InternalLock.GetLock(lockId)
+	if err != nil {
+		return err
+	}
 	if lock != nil {
-		lockReleased, _ := projectLock.InternalLock.Unlock(lockId)
+		lockReleased, err := projectLock.InternalLock.Unlock(lockId)
+		if err != nil {
+			return err
+		}
 
 		if lockReleased {
 			comment := "Project unlocked (" + projectLock.projectId() + ")."
 			projectLock.PrManager.PublishComment(prNumber, comment)
 			println("Project unlocked")
 		}
+		return nil
 	}
+	return nil
 }
 
 func (projectLock *ProjectLockImpl) projectId() string {