CI: set PKG_CONFIG_PATH explicitly (meson issue 15740)

Author: rgommers

.github/workflows/pixi.toml

@@ -25,4 +25,5 @@ wheel = "*"
 
 [tasks]
 build = { cmd = "pip install -e . --no-build-isolation", cwd = "../.." }
-test = { cmd = "pytest", cwd = "../.." }
+# Setting PKG_CONFIG_PATH is needed because Cython sanity check is broken (meson#15740)
+test = { cmd = "pytest", cwd = "../..", env = { PKG_CONFIG_PATH = "$CONDA_PREFIX/lib/pkgconfig" } }

.github/workflows/tests.yml

@@ -49,7 +49,6 @@ jobs:
         with:
           pixi-version: v0.77.1
           manifest-path: .github/workflows/pixi.toml
-          #working-directory: .github/workflows
           cache: false
 
       - name: Install meson-python