-----> Building on the Heroku-20 stack
-----> Using buildpack: heroku/ruby
-----> Ruby app detected
-----> Installing bundler 2.2.11
-----> Removing BUNDLED WITH version in the Gemfile.lock -----> Compiling Ruby/Rails
WARNING: Improperly formatted binstubs detected in your project
The following file(s) have appear to contain a problematic "shebang" line
- bin/bundle
For example bin/bundle has the shebang line:
```
#!/usr/bin/env ruby2.7
```
It should be:
```
#!/usr/bin/env ruby
```
A malformed shebang line may cause your program to crash.
For more information about binstubs and "shebang" lines see:
https://devcenter.heroku.com/articles/bad-ruby-binstub-shebang
Command: 'set -o pipefail; curl -L --fail --retry 5 --retry-delay 1 --connect-timeout 3 --max-time 30 https://s3-external-1.amazonaws.com/heroku-buildpack-ruby/heroku-20/ruby-2.7.0.tgz -s -o - | tar zxf - ' failed on attempt 1 of 3.
Command: 'set -o pipefail; curl -L --fail --retry 5 --retry-delay 1 --connect-timeout 3 --max-time 30 https://s3-external-1.amazonaws.com/heroku-buildpack-ruby/heroku-20/ruby-2.7.0.tgz -s -o - | tar zxf - ' failed on attempt 2 of 3.
! ! The Ruby version you are trying to install does not exist on this stack. ! ! You are trying to install ruby-2.7.0 on heroku-20. ! ! Ruby ruby-2.7.0 is present on the following stacks: ! ! - cedar-14 ! - heroku-16 ! - heroku-18 ! ! Heroku recommends you use the latest supported Ruby version listed here: ! https://devcenter.heroku.com/articles/ruby-support#supported-runtimes ! ! For more information on syntax for declaring a Ruby version see: ! https://devcenter.heroku.com/articles/ruby-versions ! ! Push rejected, failed to compile Ruby app. ! Push failed