v1.0.0 devtools release failed

[morgante]

See https://github.com/GoogleCloudPlatform/cloud-foundation-toolkit/runs/2785561332?check_suite_focus=true

[morgante]

It looks like the problem is they have dropped terraform-bundle support in v1.0.0: https://github.com/hashicorp/terraform/tree/v1.0.0/tools/terraform-bundle

[bharathkkb]

Looks like a good approach maybe to just set TF_PLUGIN_CACHE_DIR. Then TF 1.0 should download provider to cache if it does not exist or use the one in cache if it matches.

[morgante]

Do we even need the cache functionality still?

[bharathkkb]

I added some benchmark stats with new approach in the PR. I think since its low effort and good time improvements for developers in bigger modules we should keep it.

[morgante]

Ah, I was thinking we'd have to prepopulate the cache. I agree setting the variable is good so that at least within a test run we can avoid re-downloading. Thanks!