[build] create selenium-release target for python

Avoids using system python as part of release

Rakefile

@@ -581,9 +581,7 @@ namespace :py do
   desc 'Release Python wheel and sdist to pypi'
   task :release, [:args] do |_task, arguments|
     args = arguments[:args] || ['--stamp']
-    Rake::Task['py:build'].invoke(args)
-    sh "python3 -m twine upload bazel-bin/py/selenium-#{python_version}-py3-none-any.whl"
-    sh "python3 -m twine upload bazel-bin/py/selenium-#{python_version}.tar.gz"
+    Bazel.execute('run', args, '//py:selenium-release')
   end
 
   desc 'generate and copy files required for local development'

py/BUILD.bazel

@@ -10,6 +10,22 @@ load("//py:defs.bzl", "generate_devtools", "py_test_suite")
 load("//py/private:browsers.bzl", "BROWSERS")
 load("//py/private:import.bzl", "py_import")
 
+alias(
+    name = "twine",
+    actual = requirement("twine"),
+)
+
+genrule(
+    name = "selenium-release",
+    srcs = [
+        ":selenium-wheel",
+        ":selenium-sdist",
+    ],
+    outs = ["pypi_upload_complete.txt"],
+    cmd = "(twine upload $(location :selenium-wheel) $(location :selenium-sdist) && touch $@)",
+    tools = [":twine"],
+)
+
 compile_pip_requirements(
     # base name for generated targets, typically "requirements"
     name = "requirements",