CircleCI?

circle.yml

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+# Java Maven CircleCI 2.0 configuration file
+#
+# Check https://circleci.com/docs/2.0/language-java/ for more details
+#
+version: 2
+jobs:
+  build:
+    docker:
+      # specify the version you desire here
+      - image: circleci/openjdk:8-jdk
+      
+      # Specify service dependencies here if necessary
+      # CircleCI maintains a library of pre-built images
+      # documented at https://circleci.com/docs/2.0/circleci-images/
+      # - image: circleci/postgres:9.4
+
+    working_directory: ~/repo
+
+    environment:
+      # Customize the JVM maximum heap limit
+      MAVEN_OPTS: -Xmx3200m
+    
+    steps:
+      - checkout
+
+      # Download and cache dependencies
+      - restore_cache:
+          keys:
+          - v1-dependencies-{{ checksum "pom.xml" }}
+          # fallback to using the latest cache if no exact match is found
+          - v1-dependencies-
+
+      - run: mvn dependency:go-offline
+
+      - save_cache:
+          paths:
+            - ~/.m2
+          key: v1-dependencies-{{ checksum "pom.xml" }}
+        
+      # run tests!
+      - run: mvn clean install
+

settings.xml

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+<settings xmlns="http://maven.apache.org/SETTINGS/1.1.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+  xsi:schemaLocation="http://maven.apache.org/SETTINGS/1.1.0 http://maven.apache.org/xsd/settings-1.1.0.xsd">
+<servers>
+<server>
+      <id>sonatype-nexus-snapshots</id>
+      <username>${env.SONATYPE_USER}</username>
+      <password>${env.SONATYPE_PASSWORD}</password>
+</server>
+<server>
+    <id>sonatype-nexus-staging</id>
+    <username>${env.SONATYPE_USER}</username>
+    <password>${env.SONATYPE_PASSWORD}</password>
+</server>
+    <server>
+      <id>ossrh</id>
+      <username>${env.SONATYPE_JIRA_USER}</username>
+      <password>${env.SONATYPE_JIRA_PASS}</password>
+    </server>
+</servers>
+ <profiles>
+    <profile>
+      <id>gpg</id>
+      <properties>
+        <gpg.passphrase>${env.GPG_PASSPHRASE}</gpg.passphrase>
+      </properties>
+    </profile>
+<profile>
+<id>sonatype-staging</id>
+<repositories>
+<repository>
+<id>sonatype-staging</id>
+<url>https://oss.sonatype.org/service/local/staging/deploy/maven2/</url>
+<layout>default</layout>
+<releases><enabled>true</enabled></releases>
+</repository>
+</repositories>
+</profile>
+  </profiles>
+ <activeProfiles>
+    <activeProfile>gpg</activeProfile>
+    <activeProfile>sonatype-staging</activeProfile> 
+  </activeProfiles>
+</settings>