add headless-shell

headless-shell/README.md

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+headless-shell
+==============
+
+The [headless-shell][1] project provides a multi-arch container image,
+docker.io/chromedp/headless-shell, containing Chrome's headless-shell -- a
+slimmed down version of Chrome that is useful for driving, profiling, or
+testing web pages.
+
+[1]: https://github.com/chromedp/docker-headless-shell

headless-shell/docker-compose.yml

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+services:
+  headless-shell:
+    image: chromedp/headless-shell:stable
+    ports:
+    - "9222:9222"
+    shm_size: 2gb
+    restart: unless-stopped