Implement environment variable substitution for unix platforms

I want to be able to use this to redirect the bazel config file based
on the environment, for integration with our existing
environment-based mechanisms for selecting build configurations.

I found some opinions in comments which said this was too difficult,
which I have amended.

Closes #7318.

PiperOrigin-RevId: 237467945
8 files changed
tree: 81b1698270a11cc54a12ade3008b9838bbfeeaff
  1. .bazelci/
  2. examples/
  3. scripts/
  4. site/
  5. src/
  6. third_party/
  7. tools/
  8. .gitattributes
  9. .gitignore
  10. AUTHORS
  11. BUILD
  12. CHANGELOG.md
  13. CODEOWNERS
  14. combine_distfiles.py
  15. combine_distfiles_to_tar.sh
  16. compile.sh
  17. CONTRIBUTING.md
  18. CONTRIBUTORS
  19. distdir.bzl
  20. ISSUE_TEMPLATE.md
  21. LICENSE
  22. README.md
  23. WORKSPACE
README.md

Bazel

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