It would be simpler to do `options[:lockfile] ||= ENV["BUNDLE_LOCKFILE"]`,
but that doesn't work as `options` is frozen.

Fixes https://github.com/ruby/rubygems/pull/9117

https://github.com/ruby/rubygems/commit/6e3603a0e9

This allows for specifying the lockfile to read and write. It mirrors
the --gemfile option, and has higher priority than the lockfile
method in the Gemfile. It also mirrors the bundle lock --lockfile
option.

When the --lockfile option is used, it is applied twice. First, before
the Gemfile is read, to specify the lockfile to operate on, and again
after the Gemfile is read, so that if the Gemfile has a lockfile
method that overrides the defintion's lockfile, the --lockfile option
still has higher precedence.

https://github.com/ruby/rubygems/commit/17acdd4a89

This specifies the lockfile location. This allows for easy support
of different lockfiles per Ruby version or platform.

https://github.com/ruby/rubygems/commit/b54d65bc0a

Co-authored-by: Sutou Kouhei <kou@cozmixng.org>
Co-authored-by: Colby Swandale <996377+colby-swandale@users.noreply.github.com>

This allows for the same behavior as including `lockfile false`
in the Gemfile. This allows you to get the behavior without
modifying the Gemfile, which is useful if you do not control the
Gemfile.

This is similar to the --no-lock option already supported by
`gem install -g Gemfile`.

https://github.com/ruby/rubygems/commit/6c94623881

Co-authored-by: Colby Swandale <996377+colby-swandale@users.noreply.github.com>

This allows you to specify the lockfile to use. This is useful if
you want to use different lockfiles for different ruby versions or
platforms. You can also skip writing the lockfile by using a false
value.

https://github.com/ruby/rubygems/commit/2896aa3fc2

Co-authored-by: Colby Swandale <996377+colby-swandale@users.noreply.github.com>

(https://github.com/ruby/rubygems/pull/8183)

* Add new gem templates

* Add `--ext=go` in `bundle gem`

* Add setup-go to .github/workflows/main.yml

* Embed go version in go.mod

* Use go in bundler CI

* Add example method to template

* Install Go in .circleci/config.yml

* Install Go in .gitlab-ci.yml

* Allow hard tabs in go template

* Run `rake update_manifest`

* Fix test

* Move go_gem to gemspec

Respect to 9b0ec80

* nits: :golf:

* includes valid module name in go.mod

* generate header file

* Run `go mod tidy` to create `go.sum`

* Check if `go.sum` is generated only when Go is installed

To avoid test failure in environments where Go is not installed

* Run CI

* Workaround for hung up

c.f. https://github.com/rubygems/rubygems/actions/runs/11639408044/job/32415545422

* Write man for --ext=go

* Re-generate man with `./bin/rake man:build`

* pinning :pushpin:

* Update with `./bin/rake man:build`

* nits: Extract to method

* nits: Use `sys_exec` instead of `system`

* Clean go module cache after test

Workaround following error

```
1) bundle gem gem naming with underscore --ext parameter set with go includes go_gem extension in extconf.rb
   Failure/Error: FileUtils.rm_r(dir)

   Errno::EACCES:
     Permission denied @ apply2files - /home/runner/work/rubygems/rubygems/bundler/tmp/2.2/home/go/pkg/mod/gopkg.in/yaml.v3@v3.0.1/decode_test.go
   # ./spec/support/helpers.rb:37:in `block in reset!'
   # ./spec/support/helpers.rb:21:in `each'
   # ./spec/support/helpers.rb:21:in `reset!'
   # ./spec/spec_helper.rb:130:in `block (2 levels) in <top (required)>'
   # /home/runner/work/rubygems/rubygems/lib/rubygems.rb:303:in `load'
   # /home/runner/work/rubygems/rubygems/lib/rubygems.rb:303:in `activate_and_load_bin_path'
```

Files installed with `go get` have permissions set to 444
ref. https://github.com/golang/go/issues/35615

```
$ ls -l /home/runner/work/rubygems/rubygems/bundler/tmp/2.2/home/go/pkg/mod/gopkg.in/yaml.v3@v3.0.1/decode_test.go
-r--r--r-- 1 runner runner 42320 Nov 15 06:38 /home/runner/work/rubygems/rubygems/bundler/tmp/2.2/home/go/pkg/mod/gopkg.in/yaml.v3@v3.0.1/decode_test.go
```

So they cannot be deleted by `FileUtils.rm_r`.
Therefore, this is necessary to execute `go clean -modcache` separately from `FileUtils.rm_r` to circumvent it.

* Remove needless changes

ref. https://github.com/ruby/rubygems/pull/8183#discussion_r2532902051

* ci: setup-go is needless

* Don't run go command in `bundle gem`

ref. https://github.com/ruby/rubygems/pull/8183#discussion_r2532765470

* Revert unrelated date changes

---------

https://github.com/ruby/rubygems/commit/260d7d60b3

Co-authored-by: Hiroshi SHIBATA <hsbt@ruby-lang.org>

https://github.com/ruby/rubygems/commit/749b498822

https://github.com/rubygems/rubygems/commit/6a3342541a

https://github.com/rubygems/rubygems/commit/47c3dc19ee

Co-authored-by: Jonathan Barquero <jonbarlo@hotmail.com>