Add dpkg/rpm building capability:

* docker container definitions for package building
* cmake targets for building packages
* initial gitlab CI + artifactory integration

Builds/containers/gitlab-ci/docker_alpine_setup.sh

@@ -0,0 +1,15 @@
+#!/usr/bin/env sh
+set -ex
+# used as a before/setup script for docker steps in gitlab-ci
+# expects to be run in standard alpine/dind image
+echo $(nproc)
+docker login -u rippled \
+    -p ${ARTIFACTORY_DEPLOY_KEY_RIPPLED} ${ARTIFACTORY_HUB}
+apk add \
+    bash util-linux coreutils binutils grep \
+    make ninja cmake build-base gcc g++ abuild git \
+    python3 python3-dev
+pip3 install awscli
+# list curdir contents to build log:
+ls -la
+