chore: migrate Unity Cloud Build orchestration to V2 API

The Unity DevOps Build Automation V1 API is being deprecated:
- End of support: September 21, 2026
- Hard removal (HTTP 410): December 21, 2026

Changes:
- Update base URL to https://build-automation.services.api.unity.com/v2/
- Replace single API key auth with Service Account KEY_ID + SECRET_KEY
- Update GitHub Actions env vars to UNITY_CLOUD_KEY_ID and UNITY_CLOUD_SECRET_KEY

Ref: https://support.unity.com/hc/en-us/articles/51178448254356

Author: decentraland-bot

.github/workflows/build-unitycloud.yml

@@ -567,7 +567,8 @@ jobs:
             echo "🔧 Starting Unity Cloud Build attempt at $(date '+%Y-%m-%d %H:%M:%S')"
             python -u scripts/cloudbuild/build.py
         env:
-          API_KEY: ${{ secrets.UNITY_CLOUD_API_KEY }}
+          KEY_ID: ${{ secrets.UNITY_CLOUD_KEY_ID }}
+          SECRET_KEY: ${{ secrets.UNITY_CLOUD_SECRET_KEY }}
           ORG_ID: ${{ secrets.UNITY_CLOUD_ORG_ID }}
           PROJECT_ID: ${{ secrets.UNITY_CLOUD_PROJECT_ID }}
           POLL_TIME: 60
@@ -935,7 +936,8 @@ jobs:
       - name: Cancel Unity Cloud build
         if: ${{ cancelled() || failure() }}
         env:
-          API_KEY: ${{ secrets.UNITY_CLOUD_API_KEY }}
+          KEY_ID: ${{ secrets.UNITY_CLOUD_KEY_ID }}
+          SECRET_KEY: ${{ secrets.UNITY_CLOUD_SECRET_KEY }}
           ORG_ID: ${{ secrets.UNITY_CLOUD_ORG_ID }}
           PROJECT_ID: ${{ secrets.UNITY_CLOUD_PROJECT_ID }}
         run: python -u scripts/cloudbuild/build.py --cancel || true

scripts/cloudbuild/build.py

@@ -39,7 +39,7 @@ def _extract_member(self, member, targetpath, pwd):
 is_release_workflow = os.getenv('IS_RELEASE_BUILD', 'false').lower() == 'true'
 
 URL = utils.create_base_url(os.getenv('ORG_ID'), os.getenv('PROJECT_ID'))
-HEADERS = utils.create_headers(os.getenv('API_KEY'))
+HEADERS = utils.create_headers(os.getenv('KEY_ID'), os.getenv('SECRET_KEY'))
 
 POLL_TIME = int(os.getenv('POLL_TIME', '60'))
 QUEUE_POLL_TIME = int(os.getenv('QUEUE_POLL_TIME', '120'))

scripts/cloudbuild/utils.py

@@ -6,13 +6,12 @@
 BUILD_INFO_PATH = os.path.join(DIR, 'build_info.json')
 
 def create_base_url(org, project):
-    return f'https://build-api.cloud.unity3d.com/api/v1/orgs/{org}/projects/{project}'
+    return f'https://build-automation.services.api.unity.com/v2/orgs/{org}/projects/{project}'
 
-def create_headers(api_key):
-    # Encoding API key in Base64 format
-    credentials = f"{api_key}:"
+def create_headers(key_id, secret_key):
+    credentials = f"{key_id}:{secret_key}"
     encoded_credentials = base64.b64encode(credentials.encode('utf-8')).decode('utf-8')
-    
+
     return {
         'Authorization': f'Basic {encoded_credentials}',
         'Content-Type': 'application/json'
@@ -23,15 +22,15 @@ def persist_build_info(target, id):
         'target': target,
         'id': id
     }
-    
+
     with open(BUILD_INFO_PATH, 'w') as file:
         json.dump(data, file)
-        
+
 def read_build_info():
     if not os.path.exists(BUILD_INFO_PATH):
         print('No build_info file found!')
         return None
-    
+
     with open(BUILD_INFO_PATH, 'r') as file:
         data = json.load(file)
 
@@ -43,4 +42,4 @@ def delete_build_info():
         return
 
     os.remove(BUILD_INFO_PATH)
-    print('build_info file deleted')
+    print('build_info file deleted')