deploy the snapshot of the webapp artifact to nexus

Motivation:

Helmholtz marketplace webserver depends on this
repo artifact. Hence each new commit should
generate a snapshot that can be easily use by
the Helmholtz marketplace webserver.

Modification:

- create a settings.xml file which contain
    authentication data
- add a variable for the maven cli option that
    ensure that the artifact is deploy to the
    right server
- deploy the aritifact to nexus

Result:

Each commit and merge request will generate a new
artifact snapshot, which can be use by other repo.

Target: master

.gitlab-ci.yml

@@ -6,6 +6,7 @@ stages:
     - deploy
 
 variables:
+    MAVEN_CLI_OPTS: "-s .m2/settings.xml --batch-mode"
     MAVEN_OPTS: "-Dmaven.repo.local=.m2/repository"
 
 cache:

.gitlab/ci/ci.yml

@@ -70,7 +70,11 @@ packaging:
             - "target/*.jar"
         expire_in: 600 seconds
 
-staging:
+deploy:
+    only:
+        - master
+        - merge_requests
     stage: deploy
+    script: mvn $MAVEN_CLI_OPTS deploy
     trigger:
         project: hifis-technical-platform/helmholtz-marketplace-server

.m2/settings.xml

+<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>hifis.snapshot.repository</id>
+            <username>${env.NEXUS_REPO_USER}</username>
+            <password>${env.NEXUS_REPO_PASS}</password>
+        </server>
+    </servers>
+</settings>
\ No newline at end of file