Document how to compile a reproducible build (#18953)

* Make compiler build more reproducible

Removed the compile time from the version output.
Added Git commit's author's datetime in UTC timezone.

Fixes #18508

See https://reproducible-builds.org/docs/timestamps/
See https://reproducible-builds.org/docs/source-date-epoch/

* Revert "Make compiler build more reproducible"

This reverts commit 2f9359ae89622c2d95ef243d13251a310e94a199.

Documented how to use compile reproducible builds with the
`SOURCE_DATE_EPOCH` environment variable.

* Corrected `readme.md` formatting

Co-authored-by: quantimnot <quantimnot@users.noreply.github.com>

doc/intern.rst

@@ -68,6 +68,17 @@ More information about its options can be found in the `koch <koch.html>`_
 documentation.
 
 
+Reproducible builds
+-------------------
+
+Set the compilation timestamp with the `SOURCE_DATE_EPOCH` environment variable.
+
+.. code:: cmd
+
+  export SOURCE_DATE_EPOCH=$(git log -n 1 --format=%at)
+  koch boot # or `./build_all.sh`
+
+
 Developing the compiler
 =======================
 

doc/packaging.rst

@@ -6,6 +6,9 @@ This page provide hints on distributing Nim using OS packages.
 
 See `distros <distros.html>`_ for tools to detect Linux distribution at runtime.
 
+See `here <intern.html#bootstrapping-the-compiler-reproducible-builds>`_ for how to
+compile reproducible builds.
+
 Supported architectures
 -----------------------
 
@@ -71,3 +74,4 @@ What to install:
 - Optionally: manpages, documentation, shell completion
 - When installing documentation, .idx files are not required
 - The "compiler" directory contains compiler sources and should not be part of the compiler binary package
+