add valkey to oci-factory

oci/valkey/contacts.yaml

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+# Who and how to notify about the build progress.
+notify:
+  emails:
+    - data-platform@lists.launchpad.net
+  mattermost-channels:
+    - wxppdtg4obdg9csp9wxnqs1wqw  # alerts on DataPlatform OCI channel

oci/valkey/documentation.yaml

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+version: 1
+# --- OVERVIEW INFORMATION ---
+application: valkey
+is_chiselled: False
+description: |
+  This is an OCI image that bundles Valkey together with the metrics exporter.
+  Valkey is an open source, flexible distributed key-value datastore that is
+  optimized for caching and other realtime workloads.
+
+  # Quickstart:
+
+  To deploy a simple Valkey container:
+  ```bash
+  docker run --name valkey ubuntu/valkey:7.2.7-24.04_edge
+  ```
+
+  To connect to Valkey and check status:
+  ```bash
+  docker exec valkey valkey-cli ping
+  ```
+
+  To adjust the configuration of your Valkey container (e.g. disabling protected mode), create a config file and mount it into the container to this directory:
+  ```
+  /var/lib/valkey
+  ```
+
+# --- USAGE INFORMATION ---
+docker:
+  parameters:
+    - -p 6379:6379
+  access: Access your Valkey server at `http://localhost:6379`.
+debug:
+  text: |
+    ### Debugging
+
+    To debug the container:
+    ```bash
+    docker logs -f <valkey-container>
+    ```
+
+    To get an interactive shell:
+    ```bash
+    docker exec -it <valkey-container> /bin/bash
+    ```

oci/valkey/image.yaml

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+version: 1
+
+upload:
+  - source: "canonical/charmed-valkey-rock"
+    commit: e244d7a2887a335642ce35e2dd464f8cc41afa22
+    directory: .
+    release:
+      7.2.7-24.04:
+        end-of-life: "2025-12-01T00:00:00Z"
+        risks:
+          - edge