Dockerfile improvements#12

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secinthenet wants to merge 5 commits intoethankosakovsky:masterfrom

secinthenet:dockerfile-improve

Commits on Oct 8, 2021

Dockerfile: follow some best practices
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Commits on Oct 12, 2021

Split dockerfiles for alpine/debian
secinthenet
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Commits on Oct 16, 2021

use lockfile (requirements.txt) for better reproducibility, avoid docker cache invalidation
secinthenet
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Commits on Oct 17, 2021