chore: make release builds reproducible

[mbreithecker]

This PR makes sure that all builds (even cross-compile) are reproducible.
For the release packages it is unfortunately not possible to make the tar.gz packages reproducible across operating systems as the final compressed file is different depending on the OS. Therefore, the raw binaries are also included in the release folder now.

Summary by CodeRabbit

• New Features
  • Enhanced the build process by including a specific build time format and additional build flags for improved compilation control.
• Chores
  • Updated the release creation process to set timestamps for generated files, ensuring better tracking and consistency of builds.

[coderabbitai]

Walkthrough

The recent changes focus on enhancing the build system by incorporating a specific BUILD_TIME constant, updating BUILD_FLAGS with a new flag, and refining the release creation process to support multiple OS and architectures with timestamps and checksums.

Changes

File	Change Summary
Makefile	Added BUILD_TIME; updated BUILD_FLAGS; refactored release creation for multi-OS support with timestamps and checksums

🐰✨
In the code's dance, new steps are spun,
Time's embrace, flags now won.
Releases refined under the sun,
Timestamps set for each one.
Hoppity hop, the build is won!
🌟🐇

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[coderabbitai]

Actionable comments posted: 0

Review Details

Configuration used: CodeRabbit UI
Review profile: CHILL

Commits

Files that changed from the base of the PR and between 6e0aba8 and 3a4d92c.

Files selected for processing (1)

• Makefile (3 hunks)

Files skipped from review due to trivial changes (1)

• Makefile

[coderabbitai]

Actionable comments posted: 1

Review Details

Configuration used: CodeRabbit UI
Review profile: CHILL

Commits

Files that changed from the base of the PR and between 3a4d92c and 9cdcda0.

Files selected for processing (1)

• Makefile (3 hunks)

Additional comments not posted (3)

Makefile (3)

7-7: The addition of BUILD_TIME with the specified format looks good.

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36-36: The inclusion of -buildvcs=false in BUILD_FLAGS is appropriate for ensuring reproducible builds.

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66-71: The use of touch to set timestamps and sha256sum to generate checksums is appropriate for ensuring reproducibility and integrity.