clean up temporary bom data

[cpanato]

What type of PR is this?

/kind feature

What this PR does / why we need it:

• clean up temporary bom data

/assign @puerco

Which issue(s) this PR fixes:

clean up temporary bom data

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[puerco]

/test pull-bom-check-embedded-data

[puerco]

I think this should fix #458 ?

[cpanato]

PTAL @puerco

[puerco]

Taking a closer look at this PR, spdxTempDir is the directory that caches the SPDX license data. We intentionally leave that untouched after running to keep the parsed licenses cached for another run.

The stale tmp data mentioned in #458 is mostly downloaded go modules. These pile up after they are the are done being used for analysis and can take up GBs of data. This is the data stored in the directory defined here:

bom/pkg/spdx/gomod.go

Line 42 in 495c8d0

downloadDir = spdxTempDir + "/gomod-scanner"

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/lifecycle stale