feat: add loki rock

oci/loki/contacts.yaml

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+notify:
+  emails:
+    - observability@lists.launchpad.net
+  mattermost-channels:
+    - 1ayd5kim67bbing34i3h1x9uac

oci/loki/documentation.yaml

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+version: 1
+# --- OVERVIEW INFORMATION ---
+application: loki
+description: >
+  Loki is a horizontally scalable, highly available, multi-tenant log
+  aggregation system inspired by Prometheus. It is designed to be very cost
+  effective and easy to operate. It does not index the contents of the logs,
+  but rather a set of labels for each log stream.
+  Read more on the [official website](https://grafana.com/oss/loki/).
+
+  Please note that the images tagged up to 2.4 are Dockerfile-base images,
+  whereas from version 2.8.4 onward the images are now ROCKs. As such the
+  entrypoint is now Pebble. Read more on the
+  [Rockcraft docs](https://canonical-rockcraft.readthedocs-hosted.com/en/latest/explanation/rocks/).
+# --- USAGE INFORMATION ---
+docker:
+  parameters:
+    - -p 3100:3100
+  access: Access your Loki instance at `http://localhost:3100`.
+parameters:
+  - type: -e
+    value: 'TZ=UTC'
+    description: Timezone.
+  - type: -p
+    value: '3100:3100'
+    description: Expose Loki on `localhost:3100`.
+  - type: -v 
+    value: "/path/to/config/file:/etc/loki/local-config.yaml"
+    description: Local configuration file `local-config.yml`.
+  - type: -v
+    value: "lokidata:/loki"
+    description: "Persist data in a docker volume named `lokidata`"
+debug:
+  text: |
+    ### Debugging
+
+    To debug the container:
+
+    ```bash
+    docker logs -f loki-container
+    ```
+
+    To get an interactive shell:
+
+    ```bash
+    # For Dockerfile-based images
+    docker exec -it loki-container /bin/bash
+    # For ROCKs
+    docker exec -it loki-container exec /bin/bash
+    ```

oci/loki/image.yaml

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+version: 1
+
+upload:
+  - source: canonical/loki-rock
+    commit: 240f23fd29b0c65d2692957564f947d5a74fe006
+    directory: 2.8.4
+    release:
+      2.8.4-22.04:
+        end-of-life: "2024-08-16T00:00:00Z"
+        risks:
+          - stable
+      2.8-22.04:
+        end-of-life: "2024-08-16T00:00:00Z"
+        risks:
+          - stable
+      2-22.04:
+        end-of-life: "2024-08-16T00:00:00Z"
+        risks:
+          - stable