Apply COPY vs ADD best practices
Should only use `ADD` for URLs (and even then, `curl` or `wget` are preferred, for numerous reasons, even within this repo) and when extracting archive contents as part of the `ADD` operation; otherwise `COPY` is clearer and (slightly) more efficient.
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@ -19,8 +19,8 @@ ENV VARNISH_PORT 6081
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ENV BACKEND_HOST localhost
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ENV BACKEND_PORT 80
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ADD default.vcl /etc/varnish/default.vcl
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ADD start.sh /etc/varnish/start.sh
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COPY default.vcl /etc/varnish/default.vcl
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COPY start.sh /etc/varnish/start.sh
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RUN chmod +x /etc/varnish/start.sh
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