Add env_var and file as supported types for CI variables. Variables of
type file expose to users existing gitlab-runner behaviour - save
variable value into a temp file and set the path to this file in an ENV
var named after the variable key.

Resolves https://gitlab.com/gitlab-org/gitlab-ce/issues/46806.

This reverts commit f5201a81, reversing
changes made to 48e6db0d.

This reverts merge request !25293

This adds a concern that abstracts the concept of masking a variable,
including the RegEx for validation.

Partially addresses #47424.

Fixes that make this work:

* A change in Ruby (https://github.com/ruby/ruby/commit/ce635262f53b760284d56bb1027baebaaec175d1)
requires passing in the exact required length for OpenSSL keys and IVs.

* Ensure the secrets.yml is generated before any prepended modules are
loaded. This is done by renaming the `secret_token.rb` initializer to
`01_secret_token.rb`, which is a bit ugly but involves the least impact on
other files.

Signed-off-by: Rémy Coutable <remy@rymai.me>

This is merely to make CE and EE more compatible.
See the EE merge request at:
https://gitlab.com/gitlab-org/gitlab-ee/merge_requests/2112

Also introduce Ci::Variable#to_runner_variable to
build up the hash for runner.

Signed-off-by: Rémy Coutable <remy@rymai.me>

They were Rails' default and are unnecessarily overridden.

Signed-off-by: David Wagner <david@marvid.fr>

This reverts commit 3e991230.

# Conflicts:
#	app/models/project.rb

attr_encrypted (1.3.4 => 3.0.1) Changelog:
https://github.com/attr-encrypted/attr_encrypted/blob/master/CHANGELOG.m
d

attr_encrypted 2.x included a vulnerability, so that major version is
skipped. 3.x requires that the algorithm and mode used by each
encrypted attribute is specified explicitly.

`nil` is no longer a valid value for the encrypted_value_iv field, so
it’s changed to a randomly generated string.

In 8278b763 the default behaviour of annotation
has changes, which was causing a lot of noise in diffs. We decided in #17382
that it is better to get rid of the whole annotate gem, and instead let people
look at schema.rb for the columns in a table.

Fixes: #17382

Signed-off-by: Dmitriy Zaporozhets <dmitriy.zaporozhets@gmail.com>