repro-env - 0.4.3-2 main

Tracks a description of a desired state in *repro-env.toml*, for example, the
latest version of some official container image, with the latest patch level
and the latest version of some additional packages.
It also tracks a resolved variant in *repro-env.lock* that tracks the
specific versions and checksums of the packages needed to set up the described
environment (at the patch-level available at the time of writing).
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The purpose of *repro-env.toml* is to make it trivial to re-resolve the
specification if new patches become available. This file is read by *repro-
env update*.
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The purpose of *repro-env.lock* is to document which compiler versions have
been used for the release binary associated with a given release. Recording
this information is essential for reproducible builds and allows future
forensic investigation of the build environment. It can be either committed
into the source-code repository or attached to a release as an artifact, along
with the compiled binary. This file is read by *repro-env build*.