Set up CI with Azure Pipelines (#780)

.maven/settings.xml

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+<settings xmlns="http://maven.apache.org/SETTINGS/1.0.0"
+          xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+          xsi:schemaLocation="http://maven.apache.org/SETTINGS/1.0.0
+                      https://maven.apache.org/xsd/settings-1.0.0.xsd">
+    <servers>
+        <server>
+            <id>nexus-snapshots</id>
+            <username>${NEXUS_USER}</username>
+            <password>${NEXUS_PASSWORD}</password>
+        </server>
+    </servers>
+</settings>

azure-pipelines-snapshot.yml

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+# Starter pipeline
+# Start with a minimal pipeline that you can customize to build and deploy your code.
+# Add steps that build, run tests, deploy, and more:
+# https://aka.ms/yaml
+
+trigger: none
+
+pr: none
+
+pool:
+  vmImage: 'ubuntu-latest'
+
+steps:
+- task: Maven@3
+  displayName: Daily Snapshot Publish
+  inputs:
+    mavenPomFile: 'pom.xml'
+    options: '-DskipITs -s .maven/settings.xml'
+    mavenOptions: '-Xmx3072m'
+    javaHomeOption: 'JDKVersion'
+    jdkVersionOption: '1.8'
+    jdkArchitectureOption: 'x64'
+    publishJUnitResults: true
+    testResultsFiles: '**/surefire-reports/TEST-*.xml'
+    goals: 'clean deploy'
+  env:
+    NEXUS_USER: $(nexus_user)
+    NEXUS_PASSWORD: $(nexus_password)