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This reverts merge request !27514

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

Ruby 2.6 offers better performance and memory usage:
https://www.rubyguides.com/2018/11/ruby-2-6-new-features/

Part of https://gitlab.com/gitlab-org/gitlab-ce/issues/57323

Attempt to solve issues such as
https://gitlab.com/gitlab-org/gitlab-ce/issues/60953.

Also, play manual jobs once dependency jobs are done instead of polling
for the dependent jobs to be finished.
Signed-off-by: Rémy Coutable <remy@rymai.me>

Given Rails doesn't use the Git binary anymore, this shouldn't be a
problem.

As described in
https://www.postgresql.org/docs/current/non-durability.html, we can save
money and time by disabling durability in tests.

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

In both e2e QA tests and unit tests, reduce the number of retires
to 2 (i.e., 1 initial and one retry)

Also, move MySQL tests to run only on master branch, and on schedules.
Signed-off-by: Balasankar "Balu" C <balasankar@gitlab.com>

Remove unneeded var for webpack-prod call in gitlab-ci

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

Signed-off-by: Balasankar "Balu" C <balasankar@gitlab.com>

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

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

Instead of inserting a row after each example to an external database,
we save the CI profiling reports into the `rspec_profiling` directory
and insert the data in the update-tests-metadata CI stage.  This should
make each spec run faster and also reduce the number of PostgreSQL
connections needed by concurrent CI builds.

`scripts/insert-rspec-profiling-data` also inserts one file at a time
via the PostgreSQL COPY command for faster inserts. The one side effect
is that the `created_at` and `updated_at` timestamps aren't available
since they aren't generated in the CSV.

Closes https://gitlab.com/gitlab-org/gitlab-ee/issues/10154

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

By adding [skip visual] to the commit message the
gitlab:ui:visual test can be skipped.

This is needed to avoid deadlock situations as exhibited in
https://gitlab.com/gitlab-org/gitlab-ui/issues/198

This reverts commit 34293b5a, reversing
changes made to fdcfae2a.

Conflicts:
	.gitlab-ci.yml

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

Use self.integrity_uri over self.hexdigest_integrity_uri(digest), as the
latter always returned nil leading to improper cache invalidation.

We are alos enabling caching of `tmp/cache/assets/sprockets` again, to
get those performance gains.