Fix CircleCI errors: ignore if cache missing

[lizthegrey]

Description:
Create a mock directory so CircleCI can persist "nothing" to the workspace if there's really nothing.

Link to tracking Issue:
#702

Testing:
Rerun CircleCI

Documentation:
n/a

[lizthegrey]

Sorry for the breakage @bogdandrutu, this should fix it.

[lizthegrey]

https://circleci.com/workflow-run/07c82519-a887-4f59-ab5d-6ff77d608358

[lizthegrey]

This does appear to work now, but we may need to configure OpenTelemetry org/Circle integration now.

found it, it was

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[bogdandrutu]

@lizthegrey somehow it looks like the details redirect me to your fork in honeycombio org https://app.circleci.com/pipelines/github/honeycombio/opentelemetry-collector/26/workflows/a6429d20-e0e2-4198-b2ff-aa4858b6f275/jobs/66

[lizthegrey]

@lizthegrey somehow it looks like the details redirect me to your fork in honeycombio org app.circleci.com/pipelines/github/honeycombio/opentelemetry-collector/26/workflows/a6429d20-e0e2-4198-b2ff-aa4858b6f275/jobs/66

I have fixed it, fear not :)

[lizthegrey]

https://github.com/open-telemetry/opentelemetry-collector/pull/715/checks look good to you @bogdandrutu?

[lizthegrey]

I'm going to merge this in the interest of fixing broken builds.