migrate to xarray-contrib/minimum-dependency-versions (#10677)

* create a policy definition file

* use `xarray-contrib/minimum-dependency-versions`

* remove the min-deps script

* setup python

* bump versions

* exclude `hypothesis`

* use `python-version` to select the version

* stop ignoring `pydap` violations

We appear to have reached the point where this is not necessary
anymore (but the comment might have been wrong? We're already pinning to
`pydap=3.5.0`)

Author: keewis

.github/workflows/ci-additional.yaml

@@ -311,23 +311,18 @@ jobs:
         with:
           fetch-depth: 0 # Fetch all history for all branches and tags.
 
-      - name: Setup micromamba
-        uses: mamba-org/setup-micromamba@v2
+      - uses: actions/setup-python@v5
         with:
-          environment-name: xarray-tests
-          create-args: >-
-            python=3.12
-            pyyaml
-            python-dateutil
-            cytoolz
-            rich
-            rich-click
-            py-rattler
+          python-version: "3.x"
 
       - name: All-deps minimum versions policy
-        run: |
-          python ci/minimum_versions.py ci/requirements/min-all-deps.yml
+        uses: xarray-contrib/minimum-dependency-versions@e2ac8ff0a76e8603d8536ef5d64743a375961ce9 # v0.1.1
+        with:
+          policy: ci/policy.yaml
+          environment-paths: ci/requirements/min-all-deps.yml
 
       - name: Bare minimum versions policy
-        run: |
-          python ci/minimum_versions.py ci/requirements/bare-minimum.yml
+        uses: xarray-contrib/minimum-dependency-versions@e2ac8ff0a76e8603d8536ef5d64743a375961ce9 # v0.1.1
+        with:
+          policy: ci/policy.yaml
+          environment-paths: ci/requirements/bare-minimum.yml

ci/minimum_versions.py

@@ -0,0 +1,28 @@
+channels:
+  - conda-forge
+platforms:
+  - noarch
+  - linux-64
+policy:
+  # all packages in months
+  packages:
+    python: 30
+    numpy: 18
+  default: 12
+  # overrides for the policy
+  overrides: {}
+  # these packages are completely ignored
+  exclude:
+    - coveralls
+    - pip
+    - pytest
+    - pytest-asyncio
+    - pytest-cov
+    - pytest-env
+    - pytest-mypy-plugins
+    - pytest-timeout
+    - pytest-xdist
+    - pytest-hypothesis
+    - hypothesis
+  # these packages don't fail the CI, but will be printed in the report
+  ignored_violations: []