Exclude everything and include specific files/folders in gitattributes

Author: ruudk

.gitattributes

@@ -1,11 +1,11 @@
-/.github export-ignore
-/examples export-ignore
-/tests export-ignore
-.* export-ignore
-/captainhook.json export-ignore
-/composer.json
-/composer.lock export-ignore
-/composer-dependency-analyser.php export-ignore
-/phpstan.neon export-ignore
-/phpstan.php export-ignore
-/phpunit.xml export-ignore
+# Ignore everything by default
+* export-ignore
+
+# Include only these in distribution
+bin/ -export-ignore
+bin/** -export-ignore
+src/ -export-ignore
+src/** -export-ignore
+composer.json -export-ignore
+extension.neon -export-ignore
+LICENSE -export-ignore