CLOUD-833 - Add release and after-release Makefile targets

[tplavcic]

CHANGE DESCRIPTION

Problem: Manual steps need to be taken to prepare release branch and also to prepare main branch after release branch is merged.

Solution: With this manifests will be prepared but also next version and main images set in cr.yaml. What we need to still do manually is set specific database/backup and other images before the release since each product has it's own.

Prepare release example: make release VERSION=2.5.0 IMAGE_TAG_BASE=percona/percona-postgresql-operator

Prepare main branch after release example: make after-release VERSION=main IMAGE_TAG_BASE=perconalab/percona-postgresql-operator this above will automatically generate next version.

also works: make after-release NEXT_VER=2.6.0 IMAGE=perconalab/percona-postgresql-operator:main

CHECKLIST

Jira

• [ ] Is the Jira ticket created and referenced properly?
• [ ] Does the Jira ticket have the proper statuses for documentation (Needs Doc) and QA (Needs QA)?
• [ ] Does the Jira ticket link to the proper milestone (Fix Version field)?

Tests

• [ ] Is an E2E test/test case added for the new feature/change?
• [ ] Are unit tests added where appropriate?

Config/Logging/Testability

• [ ] Are all needed new/changed options added to default YAML files?
• [ ] Are the manifests (crd/bundle) regenerated if needed?
• [ ] Did we add proper logging messages for operator actions?
• [ ] Did we ensure compatibility with the previous version or cluster upgrade process?
• [ ] Does the change support oldest and newest supported PG version?
• [ ] Does the change support oldest and newest supported Kubernetes version?

[hors]

@tplavcic could you please check upgrade-minor test

[JNKPercona]

Test name	Status
custom-extensions	passed
demand-backup	passed
init-deploy	passed
monitoring	passed
operator-self-healing	passed
scaling	passed
scheduled-backup	passed
self-healing	passed
start-from-backup	passed
telemetry-transfer	passed
upgrade-minor	failure
users	passed
We run 12 out of 12

commit: https://github.com/percona/percona-postgresql-operator/pull/703/commits/a7c720f8775e22651095c4bb8388e3523d40cff6 image: perconalab/percona-postgresql-operator:PR-703-a7c720f87