* Add a way to deliver inbound emails by source

Great for testing when you get an eml file and can just paste it in.

* Test updates

* Fix tests

* Fix spacing

Allow logs to be tagged without a block

Calling `#tagged` without a block now returns a new logger with the tags
applied. This is useful for when you want to tag an individual log line,
rather than an entire request.

Document working with association and checkboxes in a form

Motivation:
  - I frequently look for this in the docs then struggle to rememeber
  the name of the function I need to find in the api docs. Also I think
  other people may benefit from it being easier to find.

Changes:
  - Added a section about Collection Checkboxes to the docs.
Co-Authored-By: NEileen M. Uchitelle <eileencodes@users.noreply.github.com>

Updates pg gem version

.annotate_template_file_names annotates HTML output with template names

Remove example of `ActionController::UrlRewriter`

[ci skip]

Add an example how to change column in "change_table" block

[ci skip]

[ci skip]

Align `Range#cover?` extension behavior with plain Ruby behavior for "backwards" ranges

`(1..10).cover?(5..3)` now returns `false`, as it does in plain Ruby. Previously this returned `true`.

Also update `#include?` and `#===` behavior to match.

As a developer, when looking at a page in my web browser, it's sometimes
difficult to figure out which template(s) are being used to render the page.

config.action_view.annotate_template_file_names adds HTML comments to the
rendered output indicating where each template begins and ends.
Co-authored-by: NAaron Patterson <tenderlove@github.com>

Fix invalid byte sequence error without `en_US.UTF-8` environment while rake guides:generate:html

added instructions how to release rails a plugin (gem)

* require, require_relative, load by double quotes

We're getting rid of all single quote usage, unless it serves a specific purpose, as per the general style guide.

This test doesn't assert anything since
e5a6f7ee.

This was added in 9a27b297 to silence
warnings about deprecated instance variables, see
https://discuss.rubyonrails.org/t/internal-api-errors-in-edgerails/6082
for more details.

The deprecations that it was silencing were removed in
83c8db98.

When we try to create a table which already exists which also adds
indexes, then the `if_not_exists` option passed to `create_table` is
not extended to indexes. So the migration results into an error if the
table and indexes already exist.
This change extends the `if_not_exists` support to `add_index` so that
if the migration tries to create a table which also has existing
indexes, error won't be raised.
Also as a side-effect individual `add_index` calls will also accept
`if_not_exists` option and respect it henceforth.

[Prathamesh Sonpatki, Justin George]

https://buildkite.com/rails/rails/builds/67891#867b2766-7984-4280-90d6-7f0412e2d239/1015-1026

Base64 strict-encoded CSRF tokens are not inherently websafe, which makes
them difficult to deal with. For example, the common practice of sending
the CSRF token to a browser in a client-readable cookie does not work properly
out of the box: the value has to be url-encoded and decoded to survive transport.

Now, we generate Base64 urlsafe-encoded CSRF tokens, which are inherently safe
to transport.  Validation accepts both urlsafe tokens, and strict-encoded tokens
for backwards compatibility.

fix grammar - ci skip

Co-authored-by: NJared Beck <jared@jaredbeck.com>
Co-authored-by: NJonathan Hefner <jonathan@hefner.pro>

Introduce previously_new_record? on ActiveRecord::Base

Add rubocop group to Gemfile for use in CI

Since c1e7268c we install the latest
version of RuboCop in our GitHub Actions workflow for speed, but this
sacrifices reproducibility; the results will change whenever RuboCop
publishes a new version. Instead we can add a new group to our Gemfile
that just contains the dependencies necessary to run RuboCop, and skip
installing everything else in CI.

Unfortunately it's not possible to tell Bundler to only install gems
from a single group, so we have to tell it not to install every other
group instead.

Simplify GitHub Action RuboCop by using globally installed gems

[ci skip] Fix API documentation for link_to_if

Handle paths with trailing slashes in rails test

The `rails test` command scans its arguments for test paths to load
before handing off option parsing to Minitest. To avoid incorrectly
interpreting a `-n /regex/` pattern as an absolute path to a directory,
it skips arguments that end with a slash. However a relative path ending
in a slash is not ambiguous, so we can safely treat those as test paths.

This is especially useful in bash, where tab completing a directory
leaves a trailing slash in place.

This reverts commit f265e0dd, reversing
changes made to 08dfa921.

Reverted due to surprising behavior for applications. We need to
deprecate this behavior first instead of raising by default.