Added publishing workflow

publish/Dockerfile

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+FROM java:8
+
+USER root
+
+RUN apt-get install git
+
+RUN useradd -ms /bin/bash geotrellis
+
+USER geotrellis
+
+RUN set -x \
+    && cd /home/geotrellis \
+    && git clone https://github.com/locationtech/geotrellis /home/geotrellis/geotrellis \
+    && cd /home/geotrellis/geotrellis \
+    && git checkout 1.0
+
+WORKDIR /home/geotrellis/geotrellis
+
+COPY .credentials /home/geotrellis/.ivy2/.credentials
+COPY ./gnupg/ /home/geotrellis/.gnupg/
+COPY .credentials /home/geotrellis/.sbt/0.13/local.sbt
+
+USER root
+
+RUN chown -R geotrellis:geotrellis /home/geotrellis
+
+USER geotrellis

publish/Makefile

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+IMG  := geotrellis/publish-geotrellis-container
+TAG  := "latest"
+
+build: Dockerfile
+	@cp ~/.ivy2/.credentials .credentials
+	@cp ~/.sbt/0.13/local.sbt local.sbt
+	@cp -r ~/.gnupg ./gnupg
+	docker build --no-cache -t ${IMG}:${TAG} .
+	@rm .credentials
+	@rm -r ./gnupg
+	@rm local.sbt
+
+run:
+	docker run -it ${IMG}:${TAG} /bin/bash
+
+publish:
+	docker run -it ${IMG}:${TAG} publish/publish-to-sonatype.sh

publish/README.md

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+## Publishing GeoTrellis Releases
+
+This directory contains the elements needed to publish GeoTrellis to Sonatype.
+
+## Setup
+
+You'll need to have the proper Sonatype credentials in `~/.ivy2/.credentials`,
+the proper PGP public and private key in `~/.gnupg`,
+and the password for the private key (for jar signing) in `~/.sbt/0.13/local.sbt`.
+As we change SBT versions, we'll need to modify the `Makefile` to point the correct
+file locations.
+
+We also have to change the branch that is checked out in the `Dockerfile` to the
+proper version branch as we change GeoTrellis versions.
+
+Note: Sonatype requires JARs be signd via PGP, so if you do not have keys
+with a distributed public key, you'll have to work through the instructions here:
+http://central.sonatype.org/pages/working-with-pgp-signatures.html
+
+## Building the container
+
+First build the container using `make build`. The image will always be rebuilt from
+scratch, cloning geotrellis and checking out the version branch.
+
+
+## Publishing
+
+Run `make publish`. This will run the `publish-to-sonatype.sh` script inside the
+container, and push everything to the sonatype staging repository.
+
+After that, you'll have to log in with the appropriate authentication to
+https://oss.sonatype.org/, and from there follow the release instructions
+at http://central.sonatype.org/pages/releasing-the-deployment.html.

publish/publish-to-sonatype.sh

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+#!/bin/bash
+# Publish to sonatype for all supported scala version 2.11
+
+./sbt "project macros" publish-signed \
+    && ./sbt "project vector" publish-signed \
+    && ./sbt "project proj4" publish-signed \
+    && ./sbt "project raster" publish-signed \
+    && ./sbt "project spark" publish-signed \
+    && ./sbt "project s3" publish-signed \
+    && ./sbt "project accumulo" publish-signed \
+    && ./sbt "project cassandra" publish-signed \
+    && ./sbt "project hbase" publish-signed \
+    && ./sbt "project spark-etl" publish-signed \
+    && ./sbt "project geomesa" publish-signed \
+    && ./sbt "project geotools" publish-signed \
+    && ./sbt "project shapefile" publish-signed \
+    && ./sbt "project slick" publish-signed \
+    && ./sbt "project util" publish-signed \
+    && ./sbt "project vectortile" publish-signed \
+    && ./sbt "project raster-testkit" publish-signed \
+    && ./sbt "project vector-testkit" publish-signed \
+    && ./sbt "project spark-testkit" publish-signed