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Ed Morley authored
* Updates bob-builder to a version that clears out the previous build directory, which prevents the stale files seen in #379. * Adds a `buildenv-heroku-16` Make command to simplify the building and use of the Heroku-16 binary build environment. * Sets `S3_BUCKET` and `S3_PREFIX` in the Docker image, to save having to do so manually each time. * Removes the duplication of the bob-builder dependency between `Dockerfile` and `requirements.txt`. * Disables the pip version check during Docker build, to avoid the noisy stderr warning about Ubuntu 16.04 pip being older (v8.1.1). * Adds a `.dockerignore` to speed up the Docker build, by reducing the build context transferred to the daemon from 60MB to 2MB. * Applies some Dockerfile best practices like disabling/removing cached files (since layer invalidation makes caching pointless).
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