Remove .dockerignore + Improve .gitattributes

.gitattributes

@@ -16,27 +16,25 @@
 *.yml  text
 
 # Ensure those won't be messed up with
+*.phar binary
 *.png  binary
 *.jpg  binary
 *.gif  binary
 *.ttf  binary
 
-# Ignore some meta files when creating an archive of this repository
-/.github                export-ignore
-/.editorconfig          export-ignore
-/.gitattributes         export-ignore
-/.gitignore             export-ignore
-/.dockerignore          export-ignore
-/.phpunit-watcher.yml   export-ignore
-/.styleci.yml           export-ignore
-/infection.json.dist    export-ignore
-/psalm.xml              export-ignore
-/phpunit.xml.dist       export-ignore
-/Makefile               export-ignore
-/tests                  export-ignore
-/docs                   export-ignore
+# Exclude development and metadata files from distribution archive
+*               export-ignore
+/config/       -export-ignore
+/config/**     -export-ignore
+/src/          -export-ignore
+/src/**        -export-ignore
+/stubs/        -export-ignore
+/stubs/**      -export-ignore
+/CHANGELOG.md  -export-ignore
+/composer.json -export-ignore
+/LICENSE.md    -export-ignore
+/README.md     -export-ignore
 
 # Avoid merge conflicts in CHANGELOG
 # https://about.gitlab.com/2015/02/10/gitlab-reduced-merge-conflicts-by-90-percent-with-changelog-placeholders/
 /CHANGELOG.md		merge=union
-