Pin Zarr v2 by default (#660)

* Don't include memray callback in coverage stats

* Pin to Zarr v2 by default

Author: tomwhite

.coveragerc

@@ -2,7 +2,7 @@
 omit =
     */tests/*
     cubed/array_api/*
-    cubed/extensions/*
+    cubed/diagnostics/memray.py
     cubed/runtime/executors/beam.py
     cubed/runtime/executors/coiled.py
     cubed/runtime/executors/dask*.py

.github/workflows/tests.yml

@@ -19,16 +19,11 @@ jobs:
       matrix:
         os: ["ubuntu-latest", "macos-13", "windows-latest"]
         python-version: ["3.10"]
-        PIP_FLAGS: [""]
         include:
           - os: "ubuntu-latest"
             python-version: "3.12"
           - os: "ubuntu-latest"
             python-version: "3.13"
-          # Disable until Zarr v3 is working https://github.com/cubed-dev/cubed/issues/295
-          # - os: "ubuntu-latest"
-          #   python-version: "3.12"
-          #   PIP_FLAGS: "--pre"
 
     steps:
       - name: Checkout source
@@ -53,9 +48,7 @@ jobs:
 
       - name: Install
         run: |
-          python -m pip install ${PIP_FLAGS} -e .[test]
-        env:
-          PIP_FLAGS: ${{ matrix.PIP_FLAGS }}
+          python -m pip install -e .[test]
 
       - name: Run tests
         env:

pyproject.toml

@@ -36,7 +36,7 @@ dependencies = [
     "psutil",
     "tenacity",
     "toolz",
-    "zarr",
+    "zarr < 3",
 ]
 
 [project.optional-dependencies]