Do not use env variable in the jobs matrix

Author: antonwolfy

.github/workflows/check-mkl-interfaces.yaml

@@ -10,9 +10,6 @@ permissions: read-all
 
 env:
   CHANNELS: '-c dppy/label/dev -c https://software.repos.intel.com/python/conda/ -c conda-forge --override-channels'
-  # python 3.13 is blocked since BLAS requires "mkl<2025.0" (see https://github.com/conda-forge/blas-feedstock/pull/128
-  # which depends on resolving MKL issue https://github.com/conda-forge/intel_repack-feedstock/issues/83)
-  TEST_PYTHON_VERSION: '3.12'
   TEST_ENV_NAME: 'test_onemkl_interfaces'
   RERUN_TESTS_ON_FAILURE: 'true'
   RUN_TESTS_MAX_ATTEMPTS: 2
@@ -37,7 +34,7 @@ jobs:
       matrix:
         # python 3.13 is blocked since BLAS requires "mkl<2025.0" (see https://github.com/conda-forge/blas-feedstock/pull/128
         # which depends on resolving MKL issue https://github.com/conda-forge/intel_repack-feedstock/issues/83)
-        python: [${{ env.TEST_PYTHON_VERSION }}]
+        python: ['3.12']
         os: [ubuntu-22.04] # windows-2019 - no DFT support for Windows in oneMKL
 
     permissions:
@@ -130,7 +127,9 @@ jobs:
 
     strategy:
       matrix:
-        python: [${{ env.TEST_PYTHON_VERSION }}]
+        # python 3.13 is blocked since BLAS requires "mkl<2025.0" (see https://github.com/conda-forge/blas-feedstock/pull/128
+        # which depends on resolving MKL issue https://github.com/conda-forge/intel_repack-feedstock/issues/83)
+        python: ['3.12']
         os: [ubuntu-22.04] # windows-2019 - no DFT support for Windows in oneMKL
 
     permissions: