refac: runtime settings are read once at startup and passed in through the composition root; no handler, router or repository reads environment variables

internal/infrastructure/persistence/repositories/imageRepository.go

@@ -13,11 +13,12 @@ import (
 )
 
 type ImageRepository struct {
-	db *gorm.DB
+	db        *gorm.DB
+	uploadDir string
 }
 
-func NewImageRepository(db *gorm.DB) *ImageRepository {
-	return &ImageRepository{db}
+func NewImageRepository(db *gorm.DB, uploadDir string) *ImageRepository {
+	return &ImageRepository{db, uploadDir}
 }
 
 var contentTypeExtensions = map[string]string{
@@ -28,7 +29,7 @@ var contentTypeExtensions = map[string]string{
 }
 
 func (i ImageRepository) Create(input domain.ImageInput) (domain.Image, error) {
-	uploadDir := os.Getenv("UPLOAD_DIR")
+	uploadDir := i.uploadDir
 
 	fileBytes, err := io.ReadAll(input.Content)
 	if err != nil {
@@ -57,7 +58,7 @@ func (i ImageRepository) Create(input domain.ImageInput) (domain.Image, error) {
 }
 
 func (i ImageRepository) Delete(id uint32) error {
-	uploadDir := os.Getenv("UPLOAD_DIR")
+	uploadDir := i.uploadDir
 	var entityImage entity.Image
 	err := i.db.Model(&entity.Image{}).First(&entityImage, id).Error
 	if err != nil {