[maven-release-plugin] prepare release dlcm-2.1.0-alpha1

pom.xml

@@ -5,7 +5,7 @@
     <groupId>ch.dlcm</groupId>
     <artifactId>dlcm-portal</artifactId>
     <packaging>pom</packaging>
-    <version>2.1.0-SNAPSHOT</version>
+    <version>2.1.0-alpha1</version>
 
     <properties>
         <!-- Base web context used for the Angular application -->
@@ -18,7 +18,7 @@
 
     <scm>
         <connection>scm:git:git@gitlab.unige.ch:dlcm/ui/dlcm-portal.git</connection>
-        <tag>HEAD</tag>
+        <tag>dlcm-2.1.0-alpha1</tag>
     </scm>
 
     <distributionManagement>