[fleetctl] fix deb package build

[ilpianista]

I'm trying to setup a GitLab CI job to build the deb packages, but it fails with:

Error: open output file: open build/fleet-osquery_1.35.0_amd64.deb: no such file or directory

It happens because I can't mount the build volume as I would do on my local pc. To reproduce:

docker run -it fleetdm/fleetctl package --type=deb --fleet-url=my.url --enroll-secret=mysecret

pkg and msi works fine. I can workaround it by creating the build dir first, but I think that's also fleetctl job to create it.

Checklist for submitter

• Changes file added for user-visible changes in changes/, orbit/changes/ or ee/fleetd-chrome/changes.
  See Changes files for more information.
• Input data is properly validated, SELECT * is avoided, SQL injection is prevented (using placeholders for values in statements)
• Added support on fleet's osquery simulator cmd/osquery-perf for new osquery data ingestion features.
• Added/updated tests
• If paths of existing endpoints are modified without backwards compatibility, checked the frontend/CLI for any necessary changes
• If database migrations are included, checked table schema to confirm autoupdate
• For database migrations:
  • Checked schema for all modified table for columns that will auto-update timestamps during migration.
  • Confirmed that updating the timestamps is acceptable, and will not cause unwanted side effects.
  • Ensured the correct collation is explicitly set for character columns (COLLATE utf8mb4_unicode_ci).
• Manual QA for all new/changed functionality
• For Orbit and Fleet Desktop changes:
  • Orbit runs on macOS, Linux and Windows. Check if the orbit feature/bugfix should only apply to one platform (runtime.GOOS).
  • Manual QA must be performed in the three main OSs, macOS, Windows and Linux.
  • Auto-update manual QA, from released version of component to new version (see tools/tuf/test).

[codecov]

Codecov Report

Attention: Patch coverage is 25.00000% with 3 lines in your changes missing coverage. Please review.

Project coverage is 63.12%. Comparing base (ded196d) to head (b0bc5ab).
Report is 65 commits behind head on main.

Files with missing lines	Patch %	Lines
orbit/pkg/packaging/linux_shared.go	25.00%	2 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #23796      +/-   ##
==========================================
- Coverage   63.12%   63.12%   -0.01%     
==========================================
  Files        1557     1558       +1     
  Lines      147693   147866     +173     
  Branches     3687     3687              
==========================================
+ Hits        93236    93336     +100     
- Misses      47073    47138      +65     
- Partials     7384     7392       +8     

Flag	Coverage Δ
backend	63.98% <25.00%> (-0.01%)	⬇️

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[lukeheath]

@ilpianista Thank you for the contribution! We will review soon.

[lucasmrod]

Thanks @ilpianista! I was able to reproduce. I'll merge and make some changes on top of it (use opt.NativeTooling to distinguish between fleetctl executable run mode vs. docker mode)

I've created #23893 to track this bug.

[lucasmrod]

PR: #23894 with the changes on top of these changes. Thanks again @ilpianista! (will be released in v4.61.0)