CredHub DRATs fixture fails staging (BuildpackCompileFailed) after PR #405 that removed programmatic GOVERSION

[hsinn0]

Summary

After PR #405 landed (merge commit 6558d04, implementation feecfe7), our Concourse pipeline that runs DRATs against a Toolsmiths / cf-deployment environment fails during the CredHub scenario. Pinning DRATs to the parent of that change (c6c888c) restores a passing run.

Observed failure

Test: “backing up Cloud Foundry” / CredHub instance creds path (CfCredhubSSITestCase).
Symptom: cf push of the fixture app fails with Cloud Foundry reporting something like:
Error staging application: BuildpackCompileFailed - App staging failed in the buildpack compile phase
Stack: Failure surfaces from RunCommandSuccessfully in runner/command_line_helpers.go, called from testcases/credhub_instance_creds_testcase.go during BeforeBackup (the cf push … -b go_buildpack … step).

On our foundation, behavior before #405 (still at c6c888c) is OK; at or after #405 it is not.

Environment (ours)

Foundation: cf-deployment–style env from Toolsmiths (Shepherd lease), not a hand-built laptop bosh-lite.
CI: Concourse runs the upstream task ci/tasks/drats-with-integration-config/task.yml with a custom Docker image only for the task runner; the failure is CF staging (go_buildpack), not compilation of DRATs inside the image.

Workaround

Our CI job passes if DRATs pinned to c6c888c.

The failure message from Concourse build

  Staging app and tracing logs...
     Downloading go_buildpack...
     Downloaded go_buildpack
     Cell 3f2e1d2a-9f27-4460-b139-89f8427ee89d creating container for instance b1cda50d-05b2-4a7e-8903-f1dc1bd01a4d
     Security group rules were updated
     Cell 3f2e1d2a-9f27-4460-b139-89f8427ee89d successfully created container for instance b1cda50d-05b2-4a7e-8903-f1dc1bd01a4d
     Downloading app package...
     Downloaded app package (279.8K)
     -----> Go Buildpack version 1.10.38
     -----> Installing godep 80
     Download [https://buildpacks.cloudfoundry.org/dependencies/godep/godep_80_linux_x64_cflinuxfs4_20fea317.tgz]
  Error staging application: BuildpackCompileFailed - App staging failed in the buildpack compile phase
  FAILED
  [FAILED] in [It] - /tmp/build/b7784222/src/github.com/cloudfoundry/disaster-recovery-acceptance-tests/runner/command_line_helpers.go:20 @ 04/23/26 01:44:49.139
  STEP: cleaning up the artifact @ 04/23/26 01:44:49.139
  STEP: running the Cleanup step for cf-credhub @ 04/23/26 01:44:49.15
  STEP: deleting the test secret @ 04/23/26 01:44:49.15
  [FAILED] in [AfterEach] - /tmp/build/b7784222/src/github.com/cloudfoundry/disaster-recovery-acceptance-tests/runner/cf_helpers.go:67 @ 04/23/26 01:44:49.15
  STEP: cleaning up the test context @ 04/23/26 01:44:49.151
  STEP: remove workspace directory @ 04/23/26 01:44:49.151
• [FAILED] [18.505 seconds]
backing up Cloud Foundry [It] backs up and restores a CF
/tmp/build/b7784222/src/github.com/cloudfoundry/disaster-recovery-acceptance-tests/runner/runner.go:55

  [FAILED] Expected
      <int>: 1
  to match exit code:
      <int>: 0
  In [It] at: /tmp/build/b7784222/src/github.com/cloudfoundry/disaster-recovery-acceptance-tests/runner/command_line_helpers.go:20 @ 04/23/26 01:44:49.139

  Full Stack Trace
    github.com/cloudfoundry/disaster-recovery-acceptance-tests/runner.RunCommandSuccessfully({0xc000156180, 0x22}, {0x0, 0x0, 0x0})
    	/tmp/build/b7784222/src/github.com/cloudfoundry/disaster-recovery-acceptance-tests/runner/command_line_helpers.go:20 +0x13e
    github.com/cloudfoundry/disaster-recovery-acceptance-tests/testcases.(*CfCredhubSSITestCase).BeforeBackup(_, {{{0xc000246f00, 0x2}, {0xc00015d640, 0x32}, {0xc000246f02, 0x5}, {0xc000155a80, 0x1e}, {0xc000160f30, ...}, ...}, ...})
    	/tmp/build/b7784222/src/github.com/cloudfoundry/disaster-recovery-acceptance-tests/testcases/credhub_instance_creds_testcase.go:73 +0x3e6
    github.com/cloudfoundry/disaster-recovery-acceptance-tests/runner.RunDisasterRecoveryAcceptanceTests.func2()
    	/tmp/build/b7784222/src/github.com/cloudfoundry/disaster-recovery-acceptance-tests/runner/runner.go:60 +0x17e

  There were additional failures detected.  To view them in detail run ginkgo -vv
------------------------------

Summarizing 1 Failure:
  [FAIL] backing up Cloud Foundry [It] backs up and restores a CF
  /tmp/build/b7784222/src/github.com/cloudfoundry/disaster-recovery-acceptance-tests/runner/command_line_helpers.go:20