feat: Support floating tag in product image selection

crates/stackable-operator/.pre-commit-config.yaml

@@ -39,7 +39,7 @@ repos:
         files: .*\.rs$|Cargo\.toml
 
       - id: cargo-test-all-features
-        name: cargo-test-no-default-features
+        name: cargo-test-all-default-features
         language: system
         entry: cargo test --all-features --package stackable-operator
         stages: [pre-commit, pre-merge-commit]

crates/stackable-operator/Cargo.toml

@@ -48,7 +48,7 @@ kube.workspace = true
 rand.workspace = true
 regex.workspace = true
 schemars.workspace = true
-semver.workspace = true
+semver = { workspace = true, features = ["serde"] }
 serde_json.workspace = true
 serde_yaml.workspace = true
 serde.workspace = true

crates/stackable-operator/crds/DummyCluster.yaml

@@ -1855,12 +1855,13 @@ spec:
                     description: Version of the product, e.g. `1.4.1`.
                     type: string
                   pullPolicy:
-                    default: Always
                     description: '[Pull policy](https://kubernetes.io/docs/concepts/containers/images/#image-pull-policy) used when pulling the image.'
                     enum:
                     - IfNotPresent
                     - Always
                     - Never
+                    - null
+                    nullable: true
                     type: string
                   pullSecrets:
                     description: '[Image pull secrets](https://kubernetes.io/docs/concepts/containers/images/#specifying-imagepullsecrets-on-a-pod) to pull images from a private registry.'
@@ -1886,12 +1887,47 @@ spec:
                     type: string
                   stackableVersion:
                     description: |-
-                      Stackable version of the product, e.g. `23.4`, `23.4.1` or `0.0.0-dev`.
+                      Stackable version of the product, e.g. `26.7.0` or `0.0.0-dev`.
 
-                      If not specified, the operator will use its own version, e.g. `23.4.1`. When using a nightly
+                      If not specified, the operator will use its own version, e.g. `26.7.1`. When using a nightly
                       operator or a PR version, it will use the nightly `0.0.0-dev` image.
+
+                      If this is used in combination with `stackableVersionPolicy: LatestPatch`, the correct
+                      floating tag is computed automatically, e.g. `26.7.0` becomes `26.7` for the product image.
                     nullable: true
                     type: string
+                  stackableVersionPolicy:
+                    default: Exact
+                    description: |-
+                      Configure the Stackable version policy. Defaults to `Exact`.
+
+                      Currently, two variants are supported:
+
+                      - `Exact`, which uses the exact, fully-qualified, canonical version of a product image.
+                      - `LatestPatch`, referencing a floating tag which always points to the latest patch version
+                        in the current release line. The current release line is either automatically derived by
+                        the operator based on its own version, or can be overridden with `stackableVersion`.
+
+                      A potential newer image is only pulled when Pods are rotated or their containers are
+                      restarted. Pods are NOT rotated and containers are NOT restarted automatically when a new
+                      image is available. This behaviour makes this a passive update mechanism, rather than an
+                      active one.
+
+                      It should be noted that when this field is set to `LatestPatch`, the operator automatically
+                      uses `Always` as the pull policy for product images. If set to `Exact`, `IfNotPresent` is
+                      used. Explicitly setting `pullPolicy` takes precedence.
+
+                      ### Examples
+
+                      - The `stackableVersion` field is not set, the operator falls back to its own version, eg.
+                        26.7.0. If this field is set to `LatestPatch`, the `26.7` floating tag will be used for
+                        product images, else, `26.7.0` will be used.
+                      - The `stackableVersion` field is set to `26.3.0`. If this field is set to `LatestPatch`,
+                        the `26.3` floating tag will be used for product images, else, `26.3.0` will be used.
+                    enum:
+                    - Exact
+                    - LatestPatch
+                    type: string
                 type: object
               secretClassVolume:
                 properties: