Tell the build script to disable repos/containers handling for normal builds

This disables following symlinks in the source copy. The options used
are only supported in version 20250206 and above, so add a conflicts
with older versions to the spec file as well.

contrib/osc.spec

@@ -104,6 +104,8 @@ Recommends:     %{use_python_pkg}-keyring-keyutils
 Recommends:     %{use_python_pkg}-zstandard
 
 Recommends:     %{obs_build_pkg}
+# need support for --repos-directory option
+Conflicts:      %{obs_build_pkg} < 20250206
 Recommends:     ca-certificates
 Recommends:     diffstat
 Recommends:     powerpc32

osc/build.py

@@ -1273,9 +1273,9 @@ def main(apiurl, store, opts, argv):
 
     # Make packages from buildinfo available as repos for kiwi/docker/fissile
     if build_type in ('kiwi', 'docker', 'podman', 'fissile', 'productcompose'):
-        if os.path.exists('repos'):
+        if os.path.lexists('repos'):
             shutil.rmtree('repos')
-        if os.path.exists('containers'):
+        if os.path.lexists('containers'):
             shutil.rmtree('containers')
         os.mkdir('repos')
         for i in bi.deps:
@@ -1349,6 +1349,10 @@ def main(apiurl, store, opts, argv):
                 else:
                     os.symlink(path, tffn)
 
+    else:
+        buildargs.append("--repos-directory=-")
+        buildargs.append("--containers-directory=-")
+
     if build_type == 'kiwi':
         # Is a obsrepositories tag used?
         try: