[linkcheck] Initial commit

linkcheck/Dockerfile

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+FROM google/dart as production
+RUN git clone https://github.com/filiph/linkcheck/ /linkcheck && pub global \
+    activate linkcheck
+
+ENTRYPOINT ["/root/.pub-cache/bin/linkcheck"]

linkcheck/README.md

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+# linkcheck
+
+A simple broken link checker. It's pretty fast and only returns the broken links:
+
+``` bash
+docker run -ti registry.daemons.it/linkcheck http://whatever
+```