ci: use a different dockerignore for CI

Dockerfile-ci.dockerignore

+# docker
+Dockerfile*
+docker-compose*
+
+# git
+.git
+.gitignore
+
+# npm & yarn
+node_modules
+npm-debug.log
+package-lock.json
+yarn-error.log
+
+# misc
+.devcontainer
+.DS_Store
+.vscode
+app.pid
+
+# app
+tmp/
+uploads/*