Removed keyscan from build-environment

[melinath]

This shouldn't be necessary since we don't use ssh to interact with GitHub. The build-environment image is used in PR builds so it's possible to test before merge.

Follow-up to #10318

Release Note Template for Downstream PRs (will be copied)

[modular-magician]

Hi there, I'm the Modular magician. I've detected the following information about your changes:

Diff report

Your PR generated some diffs in downstreams - here they are.

google provider: Diff ( 1 file changed, 1 insertion(+))
google-beta provider: Diff ( 1 file changed, 1 insertion(+))
terraform-google-conversion: Diff ( 1 file changed, 1 insertion(+))

[modular-magician]

Tests analytics

Total tests: 891
Passed tests: 819
Skipped tests: 72
Affected tests: 0

Click here to see the affected service packages

• compute

$\textcolor{green}{\textsf{All tests passed!}}$
View the build log

[melinath]

Looks like downstream builds are unaffected even while using the testing image:

• building the magician binary: https://pantheon.corp.google.com/cloud-build/builds/4175ae76-b7b8-4721-87c8-f787e91992ca;step=8;tab=detail?e=-13802955&mods=logs_tg_staging&project=graphite-docker-images
• tpgb-head generation: https://pantheon.corp.google.com/cloud-build/builds/4175ae76-b7b8-4721-87c8-f787e91992ca;step=11;tab=detail?e=-13802955&mods=logs_tg_staging&project=graphite-docker-images

[modular-magician]

Hi there, I'm the Modular magician. I've detected the following information about your changes:

Diff report

Your PR hasn't generated any diffs, but I'll let you know if a future commit does.