fix: add --cut flag to abuild-tar for control and data tars

The --cut flag removes end-of-archive markers which were causing
excessive padding in the tar output (11264 bytes vs ~2048 bytes).

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

Author: bordeux

scripts/generate_repo.py

@@ -332,7 +332,7 @@ def rebuild_apk_with_abuild(apk_path: Path, private_key: Optional[Path] = None,
             data_tar_gz = tmpdir / "data.tar.gz"
 
             tar_cmd = ["tar", "-C", str(data_dir), "-cf", "-", "."]
-            abuild_tar_cmd = ["abuild-tar", "--hash"]
+            abuild_tar_cmd = ["abuild-tar", "--hash", "--cut"]
 
             with open(data_tar, "wb") as out_file:
                 tar_proc = subprocess.Popen(tar_cmd, stdout=subprocess.PIPE, stderr=subprocess.DEVNULL)
@@ -362,7 +362,7 @@ def rebuild_apk_with_abuild(apk_path: Path, private_key: Optional[Path] = None,
             control_tar_gz = tmpdir / "control.tar.gz"
 
             tar_cmd = ["tar", "-C", str(control_dir), "-cf", "-", ".PKGINFO"]
-            abuild_tar_cmd = ["abuild-tar", "--hash"]
+            abuild_tar_cmd = ["abuild-tar", "--hash", "--cut"]
 
             with open(control_tar, "wb") as out_file:
                 tar_proc = subprocess.Popen(tar_cmd, stdout=subprocess.PIPE, stderr=subprocess.DEVNULL)