chore: remove package step from CI pipeline

.drone.yml

@@ -35,16 +35,6 @@ steps:
     status:
       - success
 
-- name: package
-  image: golang:1.25.8
-  commands:
-    - tar czf .build/sources.tar.gz --exclude=.build --exclude=.git --exclude=.drone.yml .
-  when:
-    event:
-      - tag
-    status:
-      - success
-
 - name: release
   image: plugins/gitea-release
   settings:
@@ -53,7 +43,6 @@ steps:
       from_secret: gitea_token
     files:
       - .build/coverage.txt
-      - .build/sources.tar.gz
       - .build/release-notes.md
     title: ${DRONE_TAG}
     note_from_file: .build/release-notes.md