CI: Extract duplicated InChI compilation step into composite action

[JanCBrammer]

InChI/.github/workflows/ci.yml

Lines 24 to 32 in 951cd66

	- name: Compile InChI library from triggering branch
	run: |
	git config --global --add safe.directory "$GITHUB_WORKSPACE" # https://github.com/actions/runner-images/issues/6775
	mkdir "$GITHUB_WORKSPACE/INCHI-1-TEST/libs"
	./INCHI-1-TEST/compile_inchi_lib.sh ${{ github.ref_name }} "$GITHUB_WORKSPACE/INCHI-1-TEST/libs"
	if [ "${{ github.ref_name }}" != "main" ]; then
	# Rename library to libinchi.so.main, since that's the name the tests expect.
	mv "$GITHUB_WORKSPACE/INCHI-1-TEST/libs/libinchi.so.${{ github.ref_name }}" "$GITHUB_WORKSPACE/INCHI-1-TEST/libs/libinchi.so.main"
	fi

[JanCBrammer]

Closing with 4f218c2.