jasmine_sprout_ota

You need:
- Working LineageOS built from source
- File hosting with direct links, for example sourceforge
- GitHub account

1. create public GitHub repository and create in it JSON file with following text:

{
  "response": [
    {
      "datetime": 1234567890,
      "filename": "ota-package.zip",
      "id": "5eb63bbbe01eeed093cb22bb8f5acdc3",
      "romtype": "unofficial",
      "size": 314572800,
      "url": "https://example.com/ota-package.zip",
      "version": "18.1"
    }
  ]
}

"datetime" - build date in UNIX timestamp, see out/build_date.txt
"filename" - name of your OTA package
"id" - update identificator, simply use password generator
"romtype" - your build type (unofficial)
"size" - OTA package size in bytes
"url" - direct link to package
"version" - ROM version

2. Go to packages/apps/Updater/res/values and open file strings.xml and find URL define (updater_server_url):

<string name="updater_server_url" translatable="false">https://download.lineageos.org/api/v1/{device}/{type}/{incr}</string>

And copy here Raw of created JSON file, for exapmle:

<string name="updater_server_url" translatable="false">https://raw.githubusercontent.com/marek-guran/jasmine_sprout_ota/main/ota.json</string>

3. Build package with OTA support with usual method with making installclean. Done! Now you have build with OTA support.