Add support for API blob upload of release attachments (#29507)

Fixes #29502

Our endpoint is not Github compatible.


https://docs.github.com/en/rest/releases/assets?apiVersion=2022-11-28#upload-a-release-asset

---------

Co-authored-by: Giteabot <teabot@gitea.io>

templates/swagger/v1_json.tmpl

@@ -12343,7 +12343,8 @@
       },
       "post": {
         "consumes": [
-          "multipart/form-data"
+          "multipart/form-data",
+          "application/octet-stream"
         ],
         "produces": [
           "application/json"
@@ -12386,8 +12387,7 @@
             "type": "file",
             "description": "attachment to upload",
             "name": "attachment",
-            "in": "formData",
-            "required": true
+            "in": "formData"
           }
         ],
         "responses": {