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>WARNING: You don't have /home/istiak/.local/share/gem/ruby/3.0.0/bin in your PATH,
gem executables will not run.
Successfully installed bundler-2.2.17
1 gem installed

For the above error run following code

```bash
export GEM_HOME="$(ruby -e 'puts Gem.user_dir')"
export PATH="$PATH:$GEM_HOME/bin"
gem list
gem update
```

Then, you can execute 

```bash
gem install bundler
gem install rails
```

You won't get any error this time.

https://stackoverflow.com/a/67403468