wf/conda: try to make sure we install the built package

Previously, conda would install from the pypdfium2-team channel instead
of using the built package we want to test.

.github/workflows/conda.yaml

@@ -27,6 +27,8 @@ defaults:
   run:
     shell: bash -el {0}
 
+# TODO it would be nice to also support building both packages in one run and testing the helpers package with the newly-built raw package, but this may be failry complicated
+
 jobs:
 
   build:
@@ -90,29 +92,30 @@ jobs:
         with:
           auto-update-conda: true
           python-version: ${{ matrix.py }}
-          channels: bblanchon,pypdfium2-team
-          channel-priority: strict
 
       - name: Download artifact
         uses: actions/download-artifact@v3
         with:
           name: conda_package
           path: conda_dist/
 
-      - name: Install
+      - name: Show debug info
         run: |
           python -VV
           ls -l conda_dist/
-          conda install -y pypdfium2_${{ inputs.package }} -c ./conda_dist/
       
-      - name: Test raw package
+      # according to the docs, --override-channels disables searching config file channels, and -c options priority decreases from left to right
+      - name: Install/Test raw package
         if: inputs.package == 'raw'
-        run: python conda/raw/minitest.py
+        run: |
+          conda install -y pypdfium2_${{ inputs.package }} --override-channels -c ./conda_dist/ -c bblanchon
+          python conda/raw/minitest.py
       
-      - name: Test helpers package
+      - name: Install/Test helpers package
         if: inputs.package == 'helpers'
         run: |
           conda install -y pytest pillow numpy
+          conda install -y pypdfium2_${{ inputs.package }} --override-channels -c ./conda_dist/ -c pypdfium2-team -c bblanchon
           pytest tests/ tests_old/
   
   publish:

README.md

@@ -40,9 +40,9 @@ pypdfium2 includes helpers to simplify common use cases, while the raw PDFium/ct
 
     Alternatively, with temporary channel config (discouraged):
     ```bash
-    conda install pypdfium2-team::pypdfium2_helpers -c bblanchon -c pypdfium2-team
+    conda install pypdfium2-team::pypdfium2_helpers --override-channels -c pypdfium2-team -c bblanchon
     ```
-
+    
     Adding the channels permanently and tightening priority is encouraged to include pypdfium2 in `conda update` by default, and to avoid accidentally replacing the install with a different channel. (If desired, you may limit the channel config to the current environment by adding `--env`.)
     Otherwise, you should be cautious when making changes to the environment.