Optimized Docker build to fix OOM errors

Dockerfile

@@ -17,7 +17,18 @@ ENV MAX_JOBS=1
 RUN git clone --depth 1 https://github.com/NVlabs/nvdiffrast.git /tmp/nvdiffrast \
     && cd /tmp/nvdiffrast \
     && python3 setup.py install
-RUN python3 - <<'PY'\nimport sysconfig\nfrom pathlib import Path\nsite = Path(sysconfig.get_paths()[\"purelib\"])\ndist = site / \"nvdiffrast-0.0.0.dist-info\"\ndist.mkdir(exist_ok=True)\n(dist / \"METADATA\").write_text(\"Metadata-Version: 2.1\\nName: nvdiffrast\\nVersion: 0.0.0\\n\")\n(dist / \"WHEEL\").write_text(\"Wheel-Version: 1.0\\nGenerator: manual\\nRoot-Is-Purelib: false\\nTag: py3-none-any\\n\")\n(dist / \"top_level.txt\").write_text(\"nvdiffrast\\n\")\n(dist / \"RECORD\").write_text(\"\")\nPY
+RUN python3 - <<'PY'
+import sysconfig
+from pathlib import Path
+
+site = Path(sysconfig.get_paths()["purelib"])
+dist = site / "nvdiffrast-0.0.0.dist-info"
+dist.mkdir(exist_ok=True)
+(dist / "METADATA").write_text("Metadata-Version: 2.1\nName: nvdiffrast\nVersion: 0.0.0\n")
+(dist / "WHEEL").write_text("Wheel-Version: 1.0\nGenerator: manual\nRoot-Is-Purelib: false\nTag: py3-none-any\n")
+(dist / "top_level.txt").write_text("nvdiffrast\n")
+(dist / "RECORD").write_text("")
+PY
 RUN python3 -c "import nvdiffrast.torch"
 RUN rm -rf /tmp/nvdiffrast