Detect previous release

Maximilian Linhoffrequested to merge
detect-previous-release into main

Summary 

$ cat gitinfo.env
GIT_DESCRIBE=v4.0.0-rc3-5-g5b4a907
PREVIOUS_RELEASE=v3.2.0

Fixes #451 (closed)

/cc @dmorcuende

Edited by Maximilian Linhoff

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