Merge pull request #3883 from nextcloud/backport/3880/stable26

[stable26] [stable29]  chore: Remove unnecessary files from release build

.nextcloudignore

@@ -3,19 +3,35 @@ src
 tests
 node_modules
 .codecov.yml
-composer.json
-composer.lock
-_config.yml
 .drone.yml
-.travis.yml
 .eslintignore
+.eslintrc.js
 .eslintrc.yml
+.git
+.github
 .gitignore
+.nextcloudignore
+.php-cs-fixer.dist.php
+.stylelintrc.js
+.travis.yml
+.tx
+babel.config.js
+build
+composer.json
+composer.lock
+cypress
+cypress.config.ts
+img/screenshots
 issue_template.md
 krankerl.toml
 Makefile
 mkdocs.yml
+node_modules
+psalm.xml
 run-eslint.sh
-webpack.*
-img/screenshots
+screenshots
+src
+tests
+tsconfig.json
 vendor
+webpack.*