Offline Build Support

Is there an existing issue?

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Use case

I'm trying to build an app using object box on an air gapped Linux machine.

Proposed solution

Add configuration/documentation on how to manually download the required native libraries so the build process doesn't fail on unreachable network.

Describe alternatives you've considered

Vendoring the entire plugin and modifying the flutter_libs/linux/CMakeLists.txt to find required deps locally.

Additional context

[1/9] Performing download step (download, verify and extract) for 'objectbox-download-populate'
-- Downloading...
   dst='/home/brandy/fmc_gui/build/linux/x64/release/_deps/objectbox-download-subbuild/objectbox-download-populate-prefix/src/objectbox-linux-x64.tar.gz'
   timeout='none'
   inactivity timeout='none'
-- Using src='https://github.com/objectbox/objectbox-c/releases/download/v4.0.2/objectbox-linux-x64.tar.gz'
-- Retrying...
...
-- Retry after 60 seconds (attempt #5) ...
-- Using src='https://github.com/objectbox/objectbox-c/releases/download/v4.0.2/objectbox-linux-x64.tar.gz'
CMake Error at objectbox-download-subbuild/objectbox-download-populate-prefix/src/objectbox-download-populate-stamp/download-objectbox-download-populate.cmake:170 (message):
  Each download failed!

Start by inspecting flutter_libs/linux/CMakeLists.txt and the CMake download step shown in the issue. Determine how the required native libraries can be supplied locally, then document or configure that workflow so an air-gapped Linux build completes without reaching the network.