ci: use conda-incubator/setup-miniconda action

The conda CI jobs are failing. And Windows has been busted for a while. Let's
just use the official action for setting up Conda to hopefully pave over
problems.

Author: indygreg

.github/workflows/anaconda.yml

@@ -19,6 +19,7 @@ jobs:
           - '3.11'
           - '3.12'
           - '3.13'
+          - '3.14'
     runs-on: 'ubuntu-24.04'
     env:
       # Enable fuzzing tests, other expensive tests.
@@ -37,20 +38,22 @@ jobs:
         with:
           persist-credentials: false
 
-      - name: Create Anaconda Environment
-        run: |
-          $CONDA/bin/conda create --yes --quiet --name env python=${{ matrix.py }}
+      - name: Setup Miniconda and Create Environment
+        uses: conda-incubator/setup-miniconda@8ee1f361103df19b6f8c8655fd3967a8ecb162d5 # v4.0.1
+        with:
+          activate-environment: env
+          python-version: "${{ matrix.py }}"
+          channels: conda-forge,defaults
 
       - name: Install Dependencies
         run: |
-          source $CONDA/bin/activate env
-          $CONDA/bin/conda install --yes --quiet --name env conda-build pip
+          conda install --yes --quiet --name base conda-build
+          conda install --yes --quiet --name env pip
           pip install --require-hashes -r ci/requirements.txt
 
       - name: Build and Test
         run: |
-          source $CONDA/bin/activate env
-          $CONDA/bin/conda build ci/conda
+          conda build ci/conda
           python ci/copy-conda-package.py
 
       - name: Upload Package
@@ -68,6 +71,7 @@ jobs:
           - '3.11'
           - '3.12'
           - '3.13'
+          - '3.14'
     runs-on: 'windows-2022'
     env:
       # Enable fuzzing tests, other expensive tests.
@@ -86,21 +90,23 @@ jobs:
         with:
           persist-credentials: false
 
-      - name: Create Anaconda Environment
-        run: |
-          C:\Miniconda\condabin\conda.bat create --yes --quiet --name env python=${{ matrix.py }}
+      - name: Setup Miniconda and Create Environment
+        uses: conda-incubator/setup-miniconda@8ee1f361103df19b6f8c8655fd3967a8ecb162d5 # v4.0.1
+        with:
+          activate-environment: env
+          python-version: "${{ matrix.py }}"
+          channels: conda-forge,defaults
 
       - name: Install Dependencies
         run: |
-          C:\Miniconda\condabin\conda.bat install --yes --quiet --name env conda-build pip
-          C:\Miniconda\envs\env\python.exe -m pip install --user --require-hashes -r ci/requirements.txt
+          conda install --yes --quiet --name base conda-build
+          conda install --yes --quiet --name env pip
+          python -m pip install --user --require-hashes -r ci/requirements.txt
 
-      # Disabled because we appear to be hitting https://github.com/conda/conda-build/issues/4835
-      # and we're not sure how to work around.
-      #- name: Build and Test
-      #  run: |
-      #    C:\Miniconda\envs\env\Scripts\conda-build.exe ci/conda
-      #    C:\Miniconda\envs\env\python.exe ci/copy-conda-package.py
+      - name: Build and Test
+        run: |
+          conda build ci/conda
+          python ci/copy-conda-package.py
 
       - name: Upload Package
         uses: actions/upload-artifact@ea165f8d65b6e75b540449e92b4886f43607fa02 # v4.6.2

ci/copy-conda-package.py

@@ -1,19 +1,25 @@
 import os
+import platform
 import shutil
 
-from conda_build.config import Config
+if platform.system() == "Linux":
+    build_dir = "/usr/share/miniconda/conda-bld"
+elif platform.system() == "Windows":
+    build_dir = "C:/Miniconda/conda-bld"
+else:
+    raise Exception("Unsupported platform: %s", platform.system())
 
-build_dir = Config().bldpkgs_dir
 dest_dir = "dist"
 
 if not os.path.exists(dest_dir):
     os.mkdir(dest_dir)
 
 print("scanning %s for packages" % build_dir)
-for p in os.listdir(build_dir):
-    if not p.endswith(".conda"):
-        continue
+for root, _, files in os.walk(build_dir):
+    for f in files:
+        source = os.path.join(root, f)
+        if not source.endswith(".conda"):
+            continue
 
-    source = os.path.join(build_dir, p)
-    print("copying %s" % source)
-    shutil.copyfile(source, os.path.join(dest_dir, p))
+        print("copying %s" % source)
+        shutil.copyfile(source, os.path.join(dest_dir, f))