* Fix if condition for upload-logs step (#87)

Previously the if condition was always evaluating to a truthy string
(e.g. 'false == "true"' or 'true == "true"') as the string comparison
(`== 'true'`) was not inside the expression syntax (`${{ }}`) and thus
being treated as a string rather than being evaluated.

* Introduce a force update value for reloading cache #82

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Co-authored-by: Leroy Hopson <github@leroy.geek.nz>