Commits on Nov 1, 2021

1. feat(Dockerfile): Use multistage build to bring in pbf executable …

   The polylines Docker image is a bit of a large one currently, as it
   includes not just Node.js and a `node_modules` directory, but a full
   compiler toolchain, an install of the Go language, the dependencies of
   the `pbf` repository from https://github.com/missinglink/pbf, and the
   final `pbf` executable that comes from it.
   
   All told, this brought the total image size to a whopping 950MB
   uncompressed.
   
   This PR makes use of multi stage builds to run the compiling of the
   `pbf` executable in a separate container. After this, all the toolchain
   and dependencies needed can be thrown away, and only the small
   executable copied to the final image.
   
   Using `container-diff` it looks like the image size, uncompressed, after
   pelias/docker-baseimage#23 as well, will be only
   322MB. That's a nice 600MB savings!
   
   Before pelias/docker-baseimage#23 the image size
   still drops to 500MB, still a healthy reduction.
   
   Replaces #262

   

   orangejulius committed Nov 1, 2021
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