shots workflow: Pillow for the icons; rerun when the icon script changes

Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01K6897PWcUEwHiqZMcVnNF6

.gitea/workflows/shots.yml

@@ -6,7 +6,7 @@ on:
   workflow_dispatch:
   push:
     branches: [main]
-    paths: [index.html, brain.js, favicon.svg, icons/icon.svg, icons/icon.html, tools/shots.sh]
+    paths: [index.html, brain.js, favicon.svg, icons/icon.svg, tools/shots.sh, tools/icons.py]
 permissions:
   contents: write
 concurrency:
@@ -33,6 +33,8 @@ jobs:
           c=$(find "$HOME/.cache/ms-playwright" -type f -name chrome -path '*chrome-linux*' | head -1)
           [ -n "$c" ] && [ -x "$c" ] || { echo "::error::no Chromium after the install"; exit 1; }
           echo "CHROME=$c" >> "$GITHUB_ENV"
+      - name: pillow
+        run: python3 -m pip install -q --break-system-packages pillow 2>/dev/null || python3 -m pip install -q pillow
       - name: shoot
         env:
           CHROME_FLAGS: "--no-sandbox --disable-dev-shm-usage --disable-gpu"