Merge branch 'sh-cache-upload-env-file' into 'main'

Axel von Bertoldirequested to merge
avonbertoldi/sh-cache-upload-env-file into main

This MR brings https://gitlab.com/gitlab-org/security/gitlab-runner/-/merge_requests/79+ over to teh canonical repo (here)

Use a dotenv file to store cache environment variables

See merge request https://gitlab.com/gitlab-org/security/gitlab-runner/-/merge_requests/79

Merged-by: Axel von Bertoldi <avonbertoldi@gitlab.com>
Approved-by: Georgi N. Georgiev <ggeorgiev@gitlab.com>
Approved-by: Axel von Bertoldi <avonbertoldi@gitlab.com>
Reviewed-by: Georgi N. Georgiev <ggeorgiev@gitlab.com>
Co-authored-by: Stan Hu <stanhu@gmail.com>
Edited by Axel von Bertoldi

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