stripe authentication error hopefully fixed w. woodpecker.ci .env var references

.woodpecker.yaml

@@ -29,6 +29,10 @@ steps:
       HEADLESS: 1
       CELERY_BROKER_URL: redis://redis:6379/0
       REDIS_URL: redis://redis:6379/1
+      STRIPE_SECRET_KEY:
+        from_secret: stripe_secret_key
+      STRIPE_PUBLISHABLE_KEY:
+        from_secret: stripe_publishable_key
     commands:
       - pip install -r requirements.txt
       - cd ./src