chore: harden and update supporting services (#6788)

* chore: harden and update supporting services

* chore(compose): pin ChromaDB and ntfy images by tag and digest

chromadb/chroma:latest and a bare binwiederhier/ntfy change underneath
an existing install on the next pull, so two hosts on the same commit
can run different sidecar builds. SearXNG is already pinned this way.

Pin chroma 1.5.9 and ntfy v2.32.0 to the multi-arch index digests that
:latest currently resolves to, so nothing changes at runtime today. The
standalone GPU files carry the same references, as
test_gpu_compose_standalone.py requires. Add a test that every sidecar
image has a release tag and a digest.

---------

Co-authored-by: Léo <leograndcontact@gmail.com>

ACKNOWLEDGMENTS.md

@@ -48,8 +48,8 @@ just composed.
 | Service | Image | Purpose | License |
 |---|---|---|---|
 | [SearXNG](https://github.com/searxng/searxng) | `searxng/searxng:2026.9.25-12f8b6515` (pinned tag; see compose) | Default metasearch backend | AGPL-3.0 |
-| [ChromaDB](https://github.com/chroma-core/chroma) | `chromadb/chroma:latest` | Vector store for memory / RAG | Apache-2.0 |
-| [ntfy](https://github.com/binwiederhier/ntfy) | `binwiederhier/ntfy` | Push notifications (self-hosted reminders) | Apache-2.0 / GPL-2.0 |
+| [ChromaDB](https://github.com/chroma-core/chroma) | `chromadb/chroma:1.5.9` (pinned digest; see compose) | Vector store for memory / RAG | Apache-2.0 |
+| [ntfy](https://github.com/binwiederhier/ntfy) | `binwiederhier/ntfy:v2.32.0` (pinned digest; see compose) | Push notifications (self-hosted reminders) | Apache-2.0 / GPL-2.0 |
 
 ## Bundled front-end libraries
 

docker-compose.gpu-amd.yml

@@ -127,7 +127,7 @@ services:
       - ${RENDER_GID:-render}
 
   chromadb:
-    image: docker.io/chromadb/chroma:latest
+    image: docker.io/chromadb/chroma:1.5.9@sha256:1e0b73a187a28757c572acba508c46f48c9e8b0acaf5c20e6d95cdedce1acdf6
     ports:
       - "${CHROMADB_BIND:-127.0.0.1}:8100:8000"
     volumes:
@@ -196,7 +196,7 @@ services:
     restart: unless-stopped
 
   ntfy:
-    image: docker.io/binwiederhier/ntfy
+    image: docker.io/binwiederhier/ntfy:v2.32.0@sha256:59250e1d8be2ee2186c4560322f625faef22ace380331f05b63f8842dbd62602
     command: serve
     ports:
       - "${NTFY_BIND:-127.0.0.1}:8091:80"

docker-compose.gpu-nvidia.yml

@@ -130,7 +130,7 @@ services:
               capabilities: [gpu]
 
   chromadb:
-    image: docker.io/chromadb/chroma:latest
+    image: docker.io/chromadb/chroma:1.5.9@sha256:1e0b73a187a28757c572acba508c46f48c9e8b0acaf5c20e6d95cdedce1acdf6
     ports:
       - "${CHROMADB_BIND:-127.0.0.1}:8100:8000"
     volumes:
@@ -199,7 +199,7 @@ services:
     restart: unless-stopped
 
   ntfy:
-    image: docker.io/binwiederhier/ntfy
+    image: docker.io/binwiederhier/ntfy:v2.32.0@sha256:59250e1d8be2ee2186c4560322f625faef22ace380331f05b63f8842dbd62602
     command: serve
     ports:
       - "${NTFY_BIND:-127.0.0.1}:8091:80"

docker-compose.yml

@@ -108,7 +108,7 @@ services:
     restart: unless-stopped
 
   chromadb:
-    image: docker.io/chromadb/chroma:latest
+    image: docker.io/chromadb/chroma:1.5.9@sha256:1e0b73a187a28757c572acba508c46f48c9e8b0acaf5c20e6d95cdedce1acdf6
     ports:
       - "${CHROMADB_BIND:-127.0.0.1}:8100:8000"
     volumes:
@@ -177,7 +177,7 @@ services:
     restart: unless-stopped
 
   ntfy:
-    image: docker.io/binwiederhier/ntfy
+    image: docker.io/binwiederhier/ntfy:v2.32.0@sha256:59250e1d8be2ee2186c4560322f625faef22ace380331f05b63f8842dbd62602
     command: serve
     ports:
       - "${NTFY_BIND:-127.0.0.1}:8091:80"

tests/test_compose_sidecar_pins.py

@@ -0,0 +1,34 @@
+"""Sidecar images must be pinned to a versioned tag and an immutable digest.
+
+A bare or ``:latest`` reference changes underneath an existing install on the
+next ``docker compose pull``/``up``, so two hosts on the same commit can run
+different ChromaDB or ntfy builds. The ``odysseus`` service is excluded: it is
+the project's own image, selected through ``ODYSSEUS_IMAGE``. The standalone
+GPU files are held equal to these services by test_gpu_compose_standalone.py.
+"""
+
+import re
+from pathlib import Path
+
+import pytest
+import yaml
+
+COMPOSE = Path(__file__).resolve().parents[1] / "docker-compose.yml"
+PINNED = re.compile(r"^[\w.\-/]+:(?P<tag>[\w.\-]+)@sha256:[0-9a-f]{64}$")
+
+
+def _sidecars():
+    services = yaml.safe_load(COMPOSE.read_text(encoding="utf-8"))["services"]
+    return {name: svc["image"] for name, svc in services.items() if name != "odysseus"}
+
+
+def test_expected_sidecars_present():
+    assert {"chromadb", "searxng", "ntfy"} <= set(_sidecars())
+
+
+@pytest.mark.parametrize("name", sorted(_sidecars()))
+def test_sidecar_image_has_version_tag_and_digest(name):
+    image = _sidecars()[name]
+    match = PINNED.match(image)
+    assert match, f"{name}: expected <repo>:<tag>@sha256:<digest>, got {image!r}"
+    assert match.group("tag") != "latest", f"{name}: pin a release tag, not latest"