Split diagnostics to a separate CI job

.github/workflows/pytest.yaml

@@ -75,28 +75,40 @@ jobs:
     - name: Upload test coverage to Codecov.io
       uses: codecov/codecov-action@v3
 
-    # TODO Use https://github.com/marketplace/actions/setup-rclone-action
-    - name: Install rclone
-      if: env.pr_from_main_repo && matrix.run-diagnostics
+  diagnostics:
+    if: env.pr_from_main_repo
+    needs: [pytest]
+    runs-on: ubuntu-latest
+
+    steps:
+    - uses: actions/checkout@v3
+      with:
+        submodules: true
+
+    - uses: actions/setup-python@v4
+      with:  # Should be the same as the latest supported version, above
+        python-version: "3.12"
+        cache: pip
+        cache-dependency-path: "**/pyproject.toml"
+
+    - name: Upgrade pip
+      run: python -m pip install --upgrade pip
+
+    - name: Install the Python package and its dependencies
+      run: pip install .[tests]
+
+    - name: Set up Rclone
+      uses: AnimMouse/setup-rclone@v1
+
+    - name: Create diagnostics and upload to Google Cloud Storage
       env:
         service_account_json: ${{ secrets.GCS_SERVICE_ACCOUNT_1 }}
       run: |
-        mkdir -p $HOME/.cache
-        pushd $HOME/.cache
-        curl -O https://downloads.rclone.org/rclone-current-linux-amd64.zip
-        popd
-        unzip $HOME/.cache/rclone-current-linux-amd64.zip
-        ls -d rclone-v* > $GITHUB_PATH
         echo "$service_account_json" >ci/service-account-key.json
-
-    - name: Create diagnostics and upload to Google Cloud Storage
-      if: env.pr_from_main_repo && matrix.run-diagnostics
-      run: |
         item historical diagnostics output/
         rclone --progress copy output ${{ env.gcs_bucket }}${{ github.run_id }}/
 
     - uses: LouisBrunner/[email protected]
-      if: env.pr_from_main_repo && matrix.run-diagnostics
       with:
         token: ${{ secrets.GITHUB_TOKEN }}
         name: Upload historical database & diagnostics