Tests

Add Copilot coding agent environment configuration #151

Job	Run time
Test on ubuntu-latest with 3.12 and gcc-12	1m 19s
Test on ubuntu-latest with 3.13 and gcc-14	56s
Test on macos-latest with 3.12 and gcc-14	56s
Test on ubuntu-latest with 3.13 and clang	54s
Test on ubuntu-latest with 3.12 and clang	1m 3s
Test on macos-latest with 3.12 and gcc-15	59s
Test on macos-latest with 3.12 and clang-15	1m 4s
Test on macos-latest with 3.13 and gcc-14	1m 16s
Test on ubuntu-latest with 3.12 and gcc-14	1m 13s
Test on macos-latest with 3.13 and clang	1m 5s
Test on macos-latest with 3.13 and clang-15	45s
Test on macos-latest with 3.12 and clang	48s
Test on macos-latest with 3.13 and gcc-15	1m 2s
Test on ubuntu-latest with 3.13 and gcc-12	58s
	14m 18s

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