fix(prepare_inputs): support relative paths

.gitlab-ci.yml

README.md

images/dag_test_workflow.svg

images/rule_graph.svg

scripts/prepare_inputs.labkey_to_snakemake.dict.tsv

scripts/prepare_inputs.py

...est_scripts_labkey_to_snakemake_table/expected_output.md5

tests/test_scripts_prepare_inputs_labkey/expected_output.md5

tests/test_scripts_prepare_inputs_labkey/test.sh

tests/test_scripts_prepare_inputs_table/expected_output.md5

tests/test_scripts_prepare_inputs_table/input_table.tsv

tests/test_scripts_prepare_inputs_table/test.sh