ATS-421 : ATS-400: Create Travis build for "alfresco-transform-core" (#25)

- login to dockerhub

_ci/init.sh

@@ -7,6 +7,7 @@ pushd "$(dirname "${BASH_SOURCE[0]}")/../"
 
 mkdir -p ${HOME}/.m2 && cp -rf _ci/settings.xml ${HOME}/.m2/
 echo "${QUAY_PASSWORD}" | docker login -u="alfresco+bamboo" --password-stdin quay.io
+echo "${DOCKERHUB_PASSWORD}" | docker login -u=${DOCKERHUB_USERNAME} --password-stdin docker.io
 find "${HOME}/.m2/repository/" -type d -name "*-SNAPSHOT*" | xargs -r -l rm -rf
 
 popd

_ci/settings.xml

@@ -70,5 +70,10 @@
             <username>alfresco+bamboo</username>
             <password>${env.QUAY_PASSWORD}</password>
         </server>
+        <server>
+            <id>docker.io</id>
+            <username>${env.DOCKERHUB_USERNAME}</username>
+            <password>${env.DOCKERHUB_PASSWORD}</password>
+        </server>
     </servers>
 </settings>