chore(docker): update .dockerignore to include files added in #20597

.dockerignore

@@ -15,23 +15,27 @@ test
 .codecov.yml
 .dockerignore
 .editorconfig
-.env
+.env*
 .eslint*
 .gitignore
 .markdownlint.jsonc
 .prettier*
 .(yarn|npm|nvm)rc
 *.md
+*.nix
 Dockerfile*
 LICENSE
 app.json
 eslint.config.mjs
 docker-compose*
+flake.lock
 fly.toml
 jsconfig.json
 npm-debug.log
 process.json
 package-lock.json
+tsdown-lib.config.ts
+tsdown-vercel.config.ts
 vitest.config.ts
 vercel.json