fix: update path to test ignore file

This is a bit fragile as the path given here should be related to where pytest is called.

tests/conda/py311-extra-ignore-file-merge/test-extra-args.yaml

@@ -1,5 +1,5 @@
 # This file is respected by repo2docker's test suite, but not repo2docker
 # itself. It is used solely to help us test repo2docker's command line flags.
 #
-- --extra-ignore-file=ignore-file
+- --extra-ignore-file=tests/conda/ignore-file
 - --ignore-file-strategy=merge

tests/conda/py311-extra-ignore-file-ours/test-extra-args.yaml

@@ -1,5 +1,5 @@
 # This file is respected by repo2docker's test suite, but not repo2docker
 # itself. It is used solely to help us test repo2docker's command line flags.
 #
-- --extra-ignore-file=ignore-file
+- --extra-ignore-file=tests/conda/ignore-file
 - --ignore-file-strategy=ours

tests/conda/py311-extra-ignore-file-theirs-without-file/test-extra-args.yaml

@@ -1,5 +1,5 @@
 # This file is respected by repo2docker's test suite, but not repo2docker
 # itself. It is used solely to help us test repo2docker's command line flags.
 #
-- --extra-ignore-file=ignore-file
+- --extra-ignore-file=tests/conda/ignore-file
 - --ignore-file-strategy=theirs

tests/conda/py311-extra-ignore-file-theirs/test-extra-args.yaml

@@ -1,5 +1,5 @@
 # This file is respected by repo2docker's test suite, but not repo2docker
 # itself. It is used solely to help us test repo2docker's command line flags.
 #
-- --extra-ignore-file=ignore-file
+- --extra-ignore-file=tests/conda/ignore-file
 - --ignore-file-strategy=theirs