ci(minter): deploy license-minter JARs to Gitea Maven registry on push

Adds <distributionManagement> at the parent POM and a push-only deploy
step in the build job. Selects the parent + core + minter via -pl so
both the plain library JAR and the Spring Boot fat CLI JAR are pushed
with their full dep tree resolvable; server-app is excluded as a
fat-jar runtime, not a library.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

pom.xml

@@ -65,6 +65,17 @@
         </repository>
     </repositories>
 
+    <distributionManagement>
+        <repository>
+            <id>gitea</id>
+            <url>https://gitea.siegeln.net/api/packages/cameleer/maven</url>
+        </repository>
+        <snapshotRepository>
+            <id>gitea</id>
+            <url>https://gitea.siegeln.net/api/packages/cameleer/maven</url>
+        </snapshotRepository>
+    </distributionManagement>
+
     <build>
         <pluginManagement>
             <plugins>