Minor dockerfile optimizations (#240)

* Replace build-essential in Docker builder image

build-essential is overkill, it pulls in all of the tools one needs to
make to build debian packages, which we are not doing. Even though this
is a builder image, it still takes time to download all the extra crud.

Replace build-essential with make gcc and g++, which are all that are
needed.

* Replace dev packages in final Docker image

The dev packages are only needed in the builder image. They add header
files and docs and things that are not needed in the final image.

Removing them and replacing them with just the runtime libraries reduces
the final image size by about 25% (160M->124M) in a local build.

Additionally, just for simplicity, zlib1g is already part of base
ubuntu minimal, so we don't even have to list it.

* Remove build-essential mention from the README

Just like the in Dockerfile, people don't need all of those packages
to build directly on their system.

Dockerfile

@@ -1,7 +1,7 @@
 FROM ubuntu:22.04 AS tippecanoe-builder
 
 RUN apt-get update \
-  && apt-get -y install build-essential libsqlite3-dev zlib1g-dev
+  && apt-get -y install make gcc g++ libsqlite3-dev zlib1g-dev
 
 COPY . /tmp/tippecanoe-src
 WORKDIR /tmp/tippecanoe-src
@@ -13,7 +13,7 @@ CMD make test
 # Using multistage build reduces the docker image size by alot by only copying the needed binaries
 FROM ubuntu:22.04
 RUN apt-get update \
-  && apt-get -y install libsqlite3-dev zlib1g-dev \
+  && apt-get -y install libsqlite3-0 \
   && rm -rf /var/lib/apt/lists/*
 COPY --from=tippecanoe-builder /tmp/tippecanoe-src/tippecanoe* /usr/local/bin/
 COPY --from=tippecanoe-builder /tmp/tippecanoe-src/tile-join /usr/local/bin/

README.md

@@ -707,7 +707,7 @@ uses md2man (`gem install md2man`).
 
 Linux:
 
-    sudo apt-get install build-essential libsqlite3-dev zlib1g-dev
+    sudo apt-get install gcc g++ make libsqlite3-dev zlib1g-dev
 
 Then build: