chore: add runner probe workflow

.gitea/workflows/runner-probe.yml

@@ -0,0 +1,43 @@
+name: Runner Probe
+
+on:
+  workflow_dispatch:
+
+jobs:
+  probe:
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Runner labels and OS
+        run: |
+          echo "=== OS ==="
+          uname -a
+          cat /etc/os-release 2>/dev/null || true
+
+      - name: Python versions
+        run: |
+          echo "=== Python ==="
+          which python3 && python3 --version || echo "python3 not found"
+          which python && python --version || echo "python not found"
+          ls /usr/bin/python* 2>/dev/null || true
+
+      - name: Node versions
+        run: |
+          echo "=== Node ==="
+          which node && node --version || echo "node not found"
+          which npm && npm --version || echo "npm not found"
+          ls /usr/bin/node* 2>/dev/null || true
+          ls ~/.nvm/versions/node/ 2>/dev/null || echo "no nvm versions"
+
+      - name: Docker
+        run: |
+          echo "=== Docker ==="
+          which docker && docker --version || echo "docker not found"
+          docker info 2>/dev/null | grep -E "Server Version|Operating System" || true
+
+      - name: User and home
+        run: |
+          echo "=== User ==="
+          whoami
+          echo "HOME=$HOME"
+          echo "PATH=$PATH"