Add GitHub Actions workflow to build Unifont BMP TTF #2
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The Unifont project has decided to stop distributing precompiled TrueType fonts for the Unicode Basic Multilingual Plane (BMP) starting with version 15.1.01. The recommended migration path is to use OpenType fonts instead, but modifying software to accommodate this new format can be costly. So if we want to continue using TTF fonts for the foreseeable future, we need to build them ourselves from source, following the official instructions.
To make this process easy, reproducible, and convenient, this PR introduces a GitHub Actions workflow that can be manually triggered for this effect, requesting the Unifont version to be built. When the workflow completes, an artifact containing the built TTF file is uploaded.
The described workflow automatically verifies that the GPG signature of the Unifont source tarball checks up with the contents of
unifoundry-keys.gpg
, which can be downloaded from https://unifoundry.com/1A09227B1F435A33_public.asc, according to the official signature verification instructions.