Set HELION_DEV_LOW_VRAM=1 on a10g CI machines (#923)

Author: yf225

.github/workflows/test.yml

@@ -131,4 +131,5 @@ jobs:
           if [[ "${{ matrix.dtype-asserts }}" == "true" ]]; then export HELION_DEBUG_DTYPE_ASSERTS=1; fi
           if [[ "${{ matrix.expecttest-accept }}" == "true" ]]; then export EXPECTTEST_ACCEPT=1; fi
           if [[ "${{ matrix.ref-eager }}" == "true" ]]; then export HELION_INTERPRET=1; fi
+          if [[ "${{ matrix.alias }}" == *"a10g"* ]]; then export HELION_DEV_LOW_VRAM=1; fi
           pytest --timeout=60