bazel build //... fails with `invalid repository name '@@'`

[hofbi]

Describe the bug A clear and concise description of what the bug is.

To Reproduce

• Clone the repo
• Install the requirements
• Run bazel build //...

Expected behavior The build passes successfully

Environment

• OS name + version: Ubuntu 20.04
• Version of the code: Latest master

Additional context

INFO: Analyzed 4 targets (110 packages loaded, 1649 targets configured).
ERROR: ~/clodl/docs/BUILD:4:8: Generating proto for Starlark doc for docs failed: (Exit 1): stardoc failed: error executing Stardoc command (from target //docs:docs) bazel-out/k8-opt-exec-ST-d57f47055a04/bin/external/io_bazel_stardoc/stardoc/stardoc '--input=@@//clodl:clodl.bzl' '--workspace_name=' '--dep_roots=.' '--dep_roots=external/' ... (remaining 1 argument skipped)

Use --sandbox_debug to see verbose messages from the sandbox and retain the sandbox build root for debugging
Exception in thread "main" com.google.devtools.build.lib.cmdline.LabelSyntaxException: invalid repository name '@@': workspace names may contain only A-Z, a-z, 0-9, '-', '_' and '.'
        at com.google.devtools.build.lib.cmdline.Label.parseAbsolute(Label.java:149)
        at com.google.devtools.build.lib.cmdline.Label.parseAbsolute(Label.java:106)
        at com.google.devtools.build.skydoc.SkydocMain.main(SkydocMain.java:210)
INFO: Elapsed time: 3.997s, Critical Path: 2.63s
INFO: 24 processes: 18 internal, 4 linux-sandbox, 2 worker.
ERROR: Build did NOT complete successfully

### Tasks