ATS-421 : Create Travis build for "alfresco-transform-core" (#21)

* ATS-421 : ATS-400: Create Travis build for "alfresco-transform-core"
   - rename mvn profile from 'enterpriseDocker' to 'local'
   - add config to publish docker image on both Quay and Docker
   - remove unused 'master' profile - similar to ATS, publish images only from master branch and on Release
   - update <distributionManagement> to publish artefacts to Nexus public (rather than Enterprise Releases)
   - add travis build configs
   - include SP branches to travis build
  - add documentation on build&release process

_ci/release.sh

@@ -0,0 +1,26 @@
+#!/usr/bin/env bash
+
+echo "=========================== Starting Release Script ==========================="
+PS4="\[\e[35m\]+ \[\e[m\]"
+set -vex
+pushd "$(dirname "${BASH_SOURCE[0]}")/../"
+
+# For PR builds only execute a Dry Run of the release
+[ "${TRAVIS_PULL_REQUEST}" = "false" ] && DRY_RUN="" || DRY_RUN="-DdryRun"
+
+# Travis CI runner work on DETACHED HEAD, so we need to checkout the release branch
+git checkout -B "${TRAVIS_BRANCH}"
+
+# Run the release plugin - with "[skip ci]" in the release commit message
+mvn -B \
+    ${DRY_RUN} \
+    -Prelease \
+    "-Darguments=-Prelease -DskipTests -Dmaven.javadoc.skip -Dadditionalparam=-Xdoclint:none" \
+    release:clean release:prepare release:perform \
+    -DscmCommentPrefix="[maven-release-plugin][skip ci] " \
+    -Dusername=alfresco-build \
+    -Dpassword=${GIT_PASSWORD}
+
+popd
+set +vex
+echo "=========================== Finishing Release Script =========================="