Explicitly add a .dockerignore rather than symlink
Alpine linux seems very confused by symlinks
DELETE
.dockerignore
-.gitignore
\ No newline at end of file

ADD
.dockerignore
+.#*
+dist
+build
+*.tar.gz
+*.egg-info
+*.py[co]
+__pycache__
+MANIFEST
+
+.DS_Store
+.cache
+
+repo2docker/s2i
+
+^bin/
+lib/
+lib64/
+share/
+include/
+
+# Docs
+generated/
+test_file_text.txt

MODIFY
.gitignore
.gitignore
@@ -14,6 +14,7 @@ repo2docker/s2i
^bin/
lib/
+lib64/
share/
include/

Explicitly add a .dockerignore rather than symlink

Alpine linux seems very confused by symlinks