Add an Alpine test Dockerfile for development purposes

[jviotti]

Useful to quickly test the project on Alpine.

Signed-off-by: Juan Cruz Viotti jv@jviotti.com

[augmentcode]

🤖 Augment PR Summary

Summary: Adds an Alpine-based test container to quickly validate building and running the project on Alpine Linux.

Changes:

• Introduced Dockerfile.test.alpine that configures, builds, installs, and runs ctest on Alpine
• Added a make alpine target to build the Alpine test image, and updated vendorpull.mask to include the new Dockerfile

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[augmentcode]

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