feat: optional S3-compatible storage for uploaded images, instead of the local upload directory

.env.example

@@ -27,3 +27,12 @@ DB_TLS=false
 DB_MAX_OPEN_CONNS=10
 DB_MAX_IDLE_CONNS=5
 DB_CONN_MAX_LIFETIME_SECONDS=300
+STORAGE_DRIVER=local
+S3_BUCKET=
+S3_REGION=us-east-1
+S3_ENDPOINT=
+S3_ACCESS_KEY_ID=
+S3_SECRET_ACCESS_KEY=
+S3_KEY_PREFIX=
+S3_PATH_STYLE=false
+S3_TLS=true