[IMP] runbot: add a cache system for dockerfiles #1294
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The `ADD` directive used for remote resources sometimes fails when the resource is not available. In order to avoid that kind of failure, this commit adds a kind of cache of those resources. In order to do that, the `ADD http...` directives are converted into `COPY` and the distant resource is downloaded in a cache directory when a `# CACHE xxxx` comment is found just before the `ADD`. Where `xxxx`is the cache validity duration in seconds.
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The
ADDdirective used for remote resources sometimes fails when the resource is not available. In order to avoid that kind of failure, this commit adds a kind of cache of those resources. In order to do that, theADD http...directives are converted intoCOPYand the distant resource is downloaded in a cache directory when a# CACHE xxxxcomment is found just before theADD. Wherexxxxis the cache validity duration in seconds.