Fix all possible setting error related storages and added some tests (#23911)

Follow up #22405

Fix #20703 

This PR rewrites storage configuration read sequences with some breaks
and tests. It becomes more strict than before and also fixed some
inherit problems.

- Move storage's MinioConfig struct into setting, so after the
configuration loading, the values will be stored into the struct but not
still on some section.
- All storages configurations should be stored on one section,
configuration items cannot be overrided by multiple sections. The
prioioty of configuration is `[attachment]` > `[storage.attachments]` |
`[storage.customized]` > `[storage]` > `default`
- For extra override configuration items, currently are `SERVE_DIRECT`,
`MINIO_BASE_PATH`, `MINIO_BUCKET`, which could be configured in another
section. The prioioty of the override configuration is `[attachment]` >
`[storage.attachments]` > `default`.
- Add more tests for storages configurations.
- Update the storage documentations.

---------

Co-authored-by: wxiaoguang <wxiaoguang@gmail.com>

modules/storage/storage.go

@@ -37,16 +37,15 @@ func IsErrInvalidConfiguration(err error) bool {
 	return ok
 }
 
-// Type is a type of Storage
-type Type string
+type Type = setting.StorageType
 
 // NewStorageFunc is a function that creates a storage
-type NewStorageFunc func(ctx context.Context, cfg interface{}) (ObjectStorage, error)
+type NewStorageFunc func(ctx context.Context, cfg *setting.Storage) (ObjectStorage, error)
 
 var storageMap = map[Type]NewStorageFunc{}
 
 // RegisterStorageType registers a provided storage type with a function to create it
-func RegisterStorageType(typ Type, fn func(ctx context.Context, cfg interface{}) (ObjectStorage, error)) {
+func RegisterStorageType(typ Type, fn func(ctx context.Context, cfg *setting.Storage) (ObjectStorage, error)) {
 	storageMap[typ] = fn
 }
 
@@ -151,11 +150,11 @@ func Init() error {
 }
 
 // NewStorage takes a storage type and some config and returns an ObjectStorage or an error
-func NewStorage(typStr string, cfg interface{}) (ObjectStorage, error) {
+func NewStorage(typStr Type, cfg *setting.Storage) (ObjectStorage, error) {
 	if len(typStr) == 0 {
-		typStr = string(LocalStorageType)
+		typStr = setting.LocalStorageType
 	}
-	fn, ok := storageMap[Type(typStr)]
+	fn, ok := storageMap[typStr]
 	if !ok {
 		return nil, fmt.Errorf("Unsupported storage type: %s", typStr)
 	}
@@ -165,7 +164,7 @@ func NewStorage(typStr string, cfg interface{}) (ObjectStorage, error) {
 
 func initAvatars() (err error) {
 	log.Info("Initialising Avatar storage with type: %s", setting.Avatar.Storage.Type)
-	Avatars, err = NewStorage(setting.Avatar.Storage.Type, &setting.Avatar.Storage)
+	Avatars, err = NewStorage(setting.Avatar.Storage.Type, setting.Avatar.Storage)
 	return err
 }
 
@@ -175,7 +174,7 @@ func initAttachments() (err error) {
 		return nil
 	}
 	log.Info("Initialising Attachment storage with type: %s", setting.Attachment.Storage.Type)
-	Attachments, err = NewStorage(setting.Attachment.Storage.Type, &setting.Attachment.Storage)
+	Attachments, err = NewStorage(setting.Attachment.Storage.Type, setting.Attachment.Storage)
 	return err
 }
 
@@ -185,19 +184,19 @@ func initLFS() (err error) {
 		return nil
 	}
 	log.Info("Initialising LFS storage with type: %s", setting.LFS.Storage.Type)
-	LFS, err = NewStorage(setting.LFS.Storage.Type, &setting.LFS.Storage)
+	LFS, err = NewStorage(setting.LFS.Storage.Type, setting.LFS.Storage)
 	return err
 }
 
 func initRepoAvatars() (err error) {
 	log.Info("Initialising Repository Avatar storage with type: %s", setting.RepoAvatar.Storage.Type)
-	RepoAvatars, err = NewStorage(setting.RepoAvatar.Storage.Type, &setting.RepoAvatar.Storage)
+	RepoAvatars, err = NewStorage(setting.RepoAvatar.Storage.Type, setting.RepoAvatar.Storage)
 	return err
 }
 
 func initRepoArchives() (err error) {
 	log.Info("Initialising Repository Archive storage with type: %s", setting.RepoArchive.Storage.Type)
-	RepoArchives, err = NewStorage(setting.RepoArchive.Storage.Type, &setting.RepoArchive.Storage)
+	RepoArchives, err = NewStorage(setting.RepoArchive.Storage.Type, setting.RepoArchive.Storage)
 	return err
 }
 
@@ -207,7 +206,7 @@ func initPackages() (err error) {
 		return nil
 	}
 	log.Info("Initialising Packages storage with type: %s", setting.Packages.Storage.Type)
-	Packages, err = NewStorage(setting.Packages.Storage.Type, &setting.Packages.Storage)
+	Packages, err = NewStorage(setting.Packages.Storage.Type, setting.Packages.Storage)
 	return err
 }
 
@@ -218,10 +217,10 @@ func initActions() (err error) {
 		return nil
 	}
 	log.Info("Initialising Actions storage with type: %s", setting.Actions.LogStorage.Type)
-	if Actions, err = NewStorage(setting.Actions.LogStorage.Type, &setting.Actions.LogStorage); err != nil {
+	if Actions, err = NewStorage(setting.Actions.LogStorage.Type, setting.Actions.LogStorage); err != nil {
 		return err
 	}
 	log.Info("Initialising ActionsArtifacts storage with type: %s", setting.Actions.ArtifactStorage.Type)
-	ActionsArtifacts, err = NewStorage(setting.Actions.ArtifactStorage.Type, &setting.Actions.ArtifactStorage)
+	ActionsArtifacts, err = NewStorage(setting.Actions.ArtifactStorage.Type, setting.Actions.ArtifactStorage)
 	return err
 }