feat: git source test

Author: remimimimimi

tests/data/pixi_build/cpp-with-git-source/.gitignore

@@ -0,0 +1,5 @@
+# pixi environments
+.pixi
+
+# The build directory
+.build

tests/data/pixi_build/cpp-with-git-source/README.md

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+# Simple C++ SDL Example with specified source path
+
+This is a simple pixi demo that showcases how to use C++ and SDL with specified source path.
+
+## How to use?
+
+Make sure you have `pixi` available in your terminal.
+Navigate to this directory and run:
+
+```shell
+
+# Start the build executable
+pixi run start
+```