Updated code to adhere to ADR018 (#293)

# Description
Updated code to adhere to ADR018 
This contains a breaking change, since the version that is specified for OPA now has to include a stackable image version.

Previously the version could be specified as "version: 3.2.1" and the operator simply added the stackable version to this. But going forward we have decided that the image version has to be explictly specified, so it will now have to be "version: 3.2.1-stackable-0.1.0" or similar.

This is in accordance with ADR18 (https://docs.stackable.tech/home/contributor/adr/ADR018-product_image_versioning.html).

*Please add a description here. This will become the commit message of the merge request later.*

CHANGELOG.md

@@ -22,6 +22,7 @@ All notable changes to this project will be documented in this file.
 - `operator-rs` `0.10.0` -> `0.15.0` ([#241], [#244], [#273]).
 - BREAKING: Renamed custom resource from `OpenPolicyAgent` to `OpaCluster` ([#244]).
 - Replace the `tempdir` crate with `tempfile` ([#287]).
+- [BREAKING] Specifying the product version has been changed to adhere to [ADR018](https://docs.stackable.tech/home/contributor/adr/ADR018-product_image_versioning.html) instead of just specifying the product version you will now have to add the Stackable image version as well, so `version: 3.5.8` becomes (for example) `version: 3.5.8-stackable0.1.0` ([#293])
 
 ### Removed
 
@@ -33,6 +34,7 @@ All notable changes to this project will be documented in this file.
 [#273]: https://github.com/stackabletech/opa-operator/pull/273
 [#287]: https://github.com/stackabletech/opa-operator/pull/287
 [#289]: https://github.com/stackabletech/opa-operator/pull/289
+[#293]: https://github.com/stackabletech/opa-operator/pull/293
 
 ## [0.8.0] - 2022-02-14
 

docs/modules/ROOT/pages/usage.adoc

@@ -16,7 +16,7 @@ To create a single node OPA (v0.37.2) cluster with Prometheus metrics exposed on
     metadata:
       name: simple-opa
     spec:
-      version: "0.37.2"
+      version: "0.37.2-stackable0.2.0"
       servers:
         roleGroups:
           default:
@@ -25,6 +25,11 @@ To create a single node OPA (v0.37.2) cluster with Prometheus metrics exposed on
                 kubernetes.io/os: linux
 ----
 
+Please note that the version you need to specify is not only the version of OPA which you want to roll out, but has to be amended with a Stackable version as shown.
+This Stackable version is the version of the underlying container image which is used to execute the processes.
+For a list of available versions please check our https://repo.stackable.tech/#browse/browse:docker:v2%2Fstackable%2Fdruid%2Ftags[image registry].
+It should generally be safe to simply use the latest image version that is available.
+
 == Bundle Sources
 
 OPA bundles are generated from `ConfigMap` objects by a side car container running along side the OPA server.

examples/simple-opa-cluster.yaml

@@ -4,7 +4,7 @@ kind: OpaCluster
 metadata:
   name: simple-opa
 spec:
-  version: "0.37.2"
+  version: "0.37.2-stackable0.2.0"
   servers:
     roleGroups:
       default:

rust/operator-binary/src/controller.rs

@@ -380,10 +380,7 @@ fn build_server_rolegroup_daemonset(
     server_config: &HashMap<PropertyNameKind, BTreeMap<String, String>>,
 ) -> Result<DaemonSet> {
     let opa_version = opa_version(opa)?;
-    let image = format!(
-        "docker.stackable.tech/stackable/opa:{}-stackable0",
-        opa_version
-    );
+    let image = format!("docker.stackable.tech/stackable/opa:{}", opa_version);
     let sa_name = format!(
         "{}-{}",
         opa.metadata.name.as_ref().unwrap(),

tests/test-definition.yaml

@@ -2,7 +2,7 @@
 dimensions:
   - name: opa
     values:
-      - 0.37.2
+      - 0.37.2-stackable0.2.0
 tests:
   - name: smoke
     dimensions: