Switch oss-check to use SwiftPM again

There might be some performance penalties when building with Bazel.

tools/oss-check

@@ -164,7 +164,7 @@ def generate_reports(branch)
       print "Linting #{iterations} iterations of #{repo} with #{branch}: 1"
       durations = []
       start = Time.now
-      command = "../builds/swiftlint-#{branch} lint --no-cache #{'--enable-all-rules' unless @only_rules_changed} --reporter xcode"
+      command = "../builds/.build/release/swiftlint lint --no-cache #{'--enable-all-rules' unless @only_rules_changed} --reporter xcode"
       File.open("../#{branch}_reports/#{repo}.txt", 'w') do |file|
         puts "\n#{command}" if @options[:verbose]
         Open3.popen2(command) do |_, stdout, wait_thr|
@@ -208,7 +208,11 @@ def build(branch)
     perform("git worktree add --detach #{dir} #{target}")
   end
 
-  build_command = "cd #{dir}; bazel build -c opt @SwiftLint//:swiftlint && mv bazel-bin/swiftlint swiftlint-#{branch}"
+  Dir.chdir(dir) do
+    FileUtils.rm_rf %w[Packages .build]
+  end
+
+  build_command = "cd #{dir}; swift build -c release"
 
   perform(build_command)
   return if $?.success?
@@ -311,26 +315,12 @@ validate_state_to_run
 fetch_origin
 set_globals
 print_rules_changed
+setup_repos
 make_directory_structure
 
 # Build & generate reports for branch & main
 %w[branch main].each do |branch|
   build(branch)
-end
-
-full_version_branch = `#{@working_dir}/builds/swiftlint-branch version --verbose`
-full_version_main = `#{@working_dir}/builds/swiftlint-main version --verbose`
-
-if full_version_branch == full_version_main
-  message "Skipping OSSCheck because SwiftLint hasn't changed compared to 'main'"
-  # Clean up
-  clean_up unless @options[:skip_clean]
-  exit
-end
-
-setup_repos
-
-%w[branch main].each do |branch|
   generate_reports(branch)
 end