build: exclude development files from git export

Author: pashamesh

.gitattributes

@@ -0,0 +1,13 @@
+# Path-based git attributes
+# https://www.kernel.org/pub/software/scm/git/docs/gitattributes.html
+
+# Ignore all test and documentation with "export-ignore".
+/.docker export-ignore
+/.github export-ignore
+/tests export-ignore
+/.editorconfig export-ignore
+/.gitattributes export-ignore
+/.gitignore export-ignore
+/.php-cs-fixer.php export-ignore
+/docker-compose.yml export-ignore
+/Makefile export-ignore