Print out release environments variables

What does this MR do and why?

Print out the release environments variables that are passed to the triggered pipeline, so it is easier to debug without downloading the artifact.

Example

An example of the expected output:

ENVIRONMENT=16-10-stable
VERSIONS={"gitaly":"16-10-stable-42668c3d","registry":"16-10-stable-42668c3d","kas":"16-10-stable-42668c3d","mailroom":"16-10-stable-42668c3d","pages":"16-10-stable-42668c3d","gitlab":"16-10-stable-42668c3d","shell":"16-10-stable-42668c3d","praefect":"16-10-stable-42668c3d"}

requested review from @jennykim-gitlab

assigned to @dat.tang.gitlab

requested review from @ggillies

changed the description

Pipeline Changes

This merge request contains changes to the pipeline configuration for the GitLab project.

Please consider the effect of the changes in this merge request on the following:

• Effects on different pipeline types
• Effects on non-canonical projects:
  • gitlab-foss
  • security
  • dev
  • personal forks
• Effects on pipeline performance

Please consider communicating these changes to the broader team following the communication guideline for pipeline changes

Reviewer roulette

Category	Reviewer	Maintainer
backend	@aish.sub (UTC-5, 7 hours behind author)	@rzwambag (UTC+2, same timezone as author)
~"Tooling"	Reviewer review is optional for ~"Tooling"	@bwill (UTC-5, 7 hours behind author)
~"Pipeline configuration"	Reviewer review is optional for ~"Pipeline configuration"	@nao.hashizume (UTC-7, 9 hours behind author)

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Proper labels assigned to this merge request. Please ignore me.

👋 @dat.tang.gitlab - please see the following guidance and update this merge request.

	1 Error
❌	Please add typebug typefeature, or typemaintenance label to this merge request.

added maintenancepipelines label

added typemaintenance label

removed typemaintenance label

removed maintenancepipelines label

approved this merge request

added maintenancepipelines typemaintenance labels

added pipeline:mr-approved label

👋 @jennykim-gitlab, thanks for approving this merge request.

This is the first time the merge request has been approved. To ensure we don't only run predictive pipelines, and we don't break master, a new pipeline will be started shortly.

Please wait for the pipeline to start before resolving this discussion and set auto-merge for the new pipeline. See merging a merge request for more details.

E2E Test Result Summary

allure-report-publisher generated test report!

e2e-test-on-gdk: ✅ test report for 4f968193

expand test summary

+------------------------------------------------------------------+
|                          suites summary                          |
+-------------+--------+--------+---------+-------+-------+--------+
|             | passed | failed | skipped | flaky | total | result |
+-------------+--------+--------+---------+-------+-------+--------+
| Govern      | 66     | 0      | 0       | 0     | 66    | ✅     |
| Verify      | 35     | 0      | 1       | 0     | 36    | ✅     |
| Plan        | 51     | 0      | 2       | 0     | 53    | ✅     |
| Create      | 96     | 0      | 9       | 0     | 105   | ✅     |
| Data Stores | 27     | 0      | 4       | 0     | 31    | ✅     |
| Monitor     | 7      | 0      | 0       | 0     | 7     | ✅     |
| Package     | 19     | 0      | 12      | 0     | 31    | ✅     |
| Release     | 5      | 0      | 0       | 0     | 5     | ✅     |
| Analytics   | 2      | 0      | 0       | 0     | 2     | ✅     |
| Manage      | 0      | 0      | 1       | 0     | 1     | ➖     |
+-------------+--------+--------+---------+-------+-------+--------+
| Total       | 308    | 0      | 29      | 0     | 337   | ✅     |
+-------------+--------+--------+---------+-------+-------+--------+

resolved all threads

Thanks @dat.tang.gitlab, it looks good to me. I think it needs an code owners approval to be able to be merged though.

approved this merge request

Small nitpick to consider, adding this output to ./scripts/construct-release-environments-versions.rb instead to minimise bash growth in CI setup

@ddieulivol : Reviewer roulette chose you! Can you please review this MR. Thanks in advance.