ci: throwaway EEVEE runner probe for #201 (not for merge)

Author: TMHSDigital

.github/workflows/probe-eevee-201.yml

@@ -0,0 +1,77 @@
+name: Probe EEVEE on runners (#201, throwaway)
+
+# Measures whether an EEVEE render works on today's ubuntu-latest, for issue #201
+# option 3. Lives only on the probe branch; never merged.
+on:
+  push:
+    branches: [probe/eevee-runner-201]
+
+permissions:
+  contents: read
+
+jobs:
+  probe:
+    name: EEVEE probe ${{ matrix.series }}
+    runs-on: ubuntu-latest
+    timeout-minutes: 30
+    strategy:
+      fail-fast: false
+      matrix:
+        series: ["5.2", "4.5"]
+    steps:
+      - uses: actions/checkout@v7
+
+      - name: Install the smoke workflow's runtime libraries (unchanged)
+        run: |
+          sudo apt-get update
+          sudo apt-get install -y --no-install-recommends \
+            xvfb libgl1 libegl1 libxrender1 libxxf86vm1 libxfixes3 libxi6 \
+            libxkbcommon0 libsm6 libice6
+
+      - name: Download Blender ${{ matrix.series }}
+        run: |
+          set -euo pipefail
+          series="${{ matrix.series }}"
+          base="https://download.blender.org/release/Blender${series}/"
+          file=$(curl -fsSL "$base" | grep -oE "blender-${series}\.[0-9]+-linux-x64\.tar\.xz" | sort -V | uniq | tail -1)
+          mkdir -p "$RUNNER_TEMP/bl"
+          curl -fSL --retry 3 -o "$RUNNER_TEMP/bl.tar.xz" "${base}${file}"
+          tar -xf "$RUNNER_TEMP/bl.tar.xz" -C "$RUNNER_TEMP/bl"
+          bl=$(find "$RUNNER_TEMP/bl" -maxdepth 2 -type f -name blender | head -1)
+          echo "BLENDER=$bl" >> "$GITHUB_ENV"
+          "$bl" --version | head -1
+
+      - name: Probe renders
+        run: |
+          set +e
+          mkdir -p "$RUNNER_TEMP/out"
+          script=showcase/shipping-crate/shipping_crate.py
+          probe() {  # label, needs_mesa, use_xvfb, engine
+            local out="$RUNNER_TEMP/out/$1.png" pre=""
+            [ "$3" = yes ] && pre="xvfb-run -a"
+            local t0=$(date +%s.%N)
+            $pre "$BLENDER" --background --factory-startup --python "$script" -- \
+              --output "$out" --engine "$4" > "$RUNNER_TEMP/out/$1.log" 2>&1
+            local rc=$? t1=$(date +%s.%N)
+            local size=$(stat -c %s "$out" 2>/dev/null || echo 0)
+            local secs=$(python3 -c "print(round($t1 - $t0, 1))")
+            echo "| $1 | ${{ matrix.series }} | $4 | xvfb=$3 | exit $rc | ${secs}s | ${size} B |" | tee -a "$RUNNER_TEMP/out/table.md"
+            grep -iE "EGL|GPU|OpenGL|backend|Error|abort" "$RUNNER_TEMP/out/$1.log" | head -8
+          }
+          echo "| probe | series | engine | display | result | wall | png |" > "$RUNNER_TEMP/out/table.md"
+          echo "| --- | --- | --- | --- | --- | --- | --- |" >> "$RUNNER_TEMP/out/table.md"
+          "$BLENDER" --background --factory-startup --python "$script" > /dev/null 2>&1; echo "check-only exit $?"
+          probe A-eevee-headless no no eevee
+          probe A-eevee-xvfb no yes eevee
+          probe A-cycles-headless no no cycles
+          sudo apt-get install -y --no-install-recommends libgl1-mesa-dri libegl-mesa0 libglx-mesa0 > /dev/null 2>&1
+          probe B-eevee-mesa-headless yes no eevee
+          probe B-eevee-mesa-xvfb yes yes eevee
+          cat "$RUNNER_TEMP/out/table.md" >> "$GITHUB_STEP_SUMMARY"
+          exit 0
+
+      - uses: actions/upload-artifact@v4
+        if: always()
+        with:
+          name: eevee-probe-${{ matrix.series }}
+          path: ${{ runner.temp }}/out/