use batch mode in CI builds

Do not bloat the log with progress output.

.drone.yml

@@ -5,7 +5,7 @@ steps:
   - name: compile
     image: maven:3-jdk-11
     commands:
-      - mvn clean compile
+      - mvn -B clean compile
     when:
       branch:
         - master
@@ -16,7 +16,7 @@ steps:
   - name: unit-tests
     image: maven:3-jdk-11
     commands:
-      - mvn test -P offline-tests
+      - mvn -B resources:testResources compiler:testCompile surefire:test -P offline-tests
     when:
       branch:
         - develop
@@ -32,7 +32,7 @@ steps:
       - unzip vault_1.6.0_linux_amd64.zip
       - rm vault_1.6.0_linux_amd64.zip
       - mv vault /bin/
-      - mvn test
+      - mvn -B resources:testResources compiler:testCompile surefire:test
     when:
       branch:
         - master

.travis.yml

@@ -30,16 +30,16 @@ jobs:
     - stage: Compile
       name: Compile
       script:
-        - mvn clean compile
+        - mvn -B clean compile
     - stage: Test
       name: Unit Tests
       if: NOT branch =~ ^master|(release/.+)$
       script:
-        - mvn test -P offline-tests
+        - mvn -B resources:testResources compiler:testCompile surefire:test -P offline-tests
     - name: Unit and Integration Tests
       if: branch =~ ^master|(release/.+)$
       script:
-        - mvn -P coverage clean package
+        - mvn -B -P coverage clean package
       after_success:
         - if [ "$TRAVIS_BRANCH" = "master" ]; then mvn sonar:sonar; fi