CI: update .distignore build step

Author: doekenorg

.distignore

@@ -0,0 +1,31 @@
+.gitattributes
+.gitignore
+.distignore
+.phplint.yml
+_config.yml
+composer.json
+composer.lock
+phpcs.xml
+phpstan.neon
+phpunit.xml
+phpunit.xml.dist
+.phpunit.result.cache
+.phplint-cache
+README.md
+strauss.phar
+build/strauss.phar
+build/composer.lock
+build/composer.json
+tests
+phpstan-stubs
+
+/.circleci
+/.claude
+/.github
+/.git
+/.idea
+/tests
+/vendor
+/vendor_prefixed
+/src
+/assets