Update olm_manifests.md

Author: razvan

.github/ISSUE_TEMPLATE/olm_manifests.md

@@ -7,13 +7,47 @@ assignees: ''
 
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+This is a list of steps you can follow to generate, install and test Operator Lifecycle Management (OLM) manifests for the Stackable Data Platform.
+
+The manigest generation is fully automated for all operators except two: the `secret` and the `listener` operator. These two required manual intervention.
+
+OLM manifests can be generated at any time and for any version of the operators (including `0.0.0-dev`) but it's specially needed after a platform release, to certify the new operator versions.
+
+To generate manifests for a released version of the SDP, ensure that you checkout the appropriate branch of the operator repository and the openshift operator repository.
+
 ## Pre-requisites
 
-TODO: stackable-utils, openshift cert repo, etc.
+In addition to the usual development tools like `git` and `Python` you need to clone the following repositories, idealy in the same location (this guide assumes `$HOME/repo/stackable`):
+
+* https://github.com/stackabletech/stackable-utils - contains utility scripts that you'll use below
+* https://github.com/stackabletech/openshift-certified-operators - a fork used to submit SDP operators for certification
+* Operator repositories that you intend to use like:
+  * https://github.com/stackabletech/airflow-operator/
+  * https://github.com/stackabletech/druid-operator/
+  * https://github.com/stackabletech/commons-operator/
+  * ... and so on
+
+This issue assumes you are generating OLM manifests for a released SDP version with the intention of certifying it. This means:
+
+- [ ] All operator repositories have the required release branch. These releases have been tested and are generally available.
+- [ ] All container images have been published to quay.io
+
 
 ## Secret operator
 
-    build-manifests.sh
+- [ ] Create release branch (from `main`) in the openshift operator repository
+
+      cd $HOME/repo/stackable/openshift-certified-operators
+      git switch -c stackable-secret-24.3.0
+      
+- [ ] Generate manifests
+      
+    ./olm/build-manifests.sh -r 24.3.0 -c $HOME/repo/stackable/openshift-certified-operators -o $HOME/repo/stackable/secret-operator
+
+Options:
+* `-r 24.3.0` is the SDP release
+* `-c $HOME/repo/stackable/openshift-certified-operators` the location of the openshift operator repository
+* `-o $HOME/repo/stackable/secret-operator` the location of the secret op
 
 ## Listener operator