fix mmg for linux

Author: zasexton

.github/workflows/test-upload.yml

@@ -165,7 +165,8 @@ jobs:
             set -euo pipefail; \
             /opt/python/cp39-cp39/bin/python -m pip install -U pip; \
             /opt/python/cp39-cp39/bin/python -m pip install --no-deps /dist/$wheel_arm_base; \
-            /opt/python/cp39-cp39/bin/python - <<'PY'\nimport os\nimport subprocess\nimport tempfile\n\nos.chdir(tempfile.mkdtemp(prefix='svv-wheel-validate-'))\n\nfrom svv.utils.remeshing.mmg import get_mmg_exe\n\nexe = get_mmg_exe('mmgs')\nprint('MMG selected:', exe)\nproc = subprocess.run([str(exe), '-h'], stdout=subprocess.DEVNULL, stderr=subprocess.DEVNULL, timeout=10, check=False)\nprint('mmgs -h exit:', proc.returncode)\nPY"
+            /opt/python/cp39-cp39/bin/python -c \"import os, subprocess, tempfile; os.chdir(tempfile.mkdtemp(prefix='svv-wheel-validate-')); from svv.utils.remeshing.mmg import get_mmg_exe; exe = get_mmg_exe('mmgs'); print('MMG selected:', exe); proc = subprocess.run([str(exe), '-h'], stdout=subprocess.DEVNULL, stderr=subprocess.DEVNULL, timeout=10, check=False); print('mmgs -h exit:', proc.returncode)\" \
+          "
 
       - name: Upload artifacts
         uses: actions/upload-artifact@v4

.github/workflows/upload.yml

@@ -165,7 +165,8 @@ jobs:
             set -euo pipefail; \
             /opt/python/cp39-cp39/bin/python -m pip install -U pip; \
             /opt/python/cp39-cp39/bin/python -m pip install --no-deps /dist/$wheel_arm_base; \
-            /opt/python/cp39-cp39/bin/python - <<'PY'\nimport os\nimport subprocess\nimport tempfile\n\nos.chdir(tempfile.mkdtemp(prefix='svv-wheel-validate-'))\n\nfrom svv.utils.remeshing.mmg import get_mmg_exe\n\nexe = get_mmg_exe('mmgs')\nprint('MMG selected:', exe)\nproc = subprocess.run([str(exe), '-h'], stdout=subprocess.DEVNULL, stderr=subprocess.DEVNULL, timeout=10, check=False)\nprint('mmgs -h exit:', proc.returncode)\nPY"
+            /opt/python/cp39-cp39/bin/python -c \"import os, subprocess, tempfile; os.chdir(tempfile.mkdtemp(prefix='svv-wheel-validate-')); from svv.utils.remeshing.mmg import get_mmg_exe; exe = get_mmg_exe('mmgs'); print('MMG selected:', exe); proc = subprocess.run([str(exe), '-h'], stdout=subprocess.DEVNULL, stderr=subprocess.DEVNULL, timeout=10, check=False); print('mmgs -h exit:', proc.returncode)\" \
+          "
 
       - name: Upload artifacts
         uses: actions/upload-artifact@v4