Merge branch 'f-context-root' into 'dev'

BUG: wrong generation of host root with context root

See merge request caosdb/caosdb-server!35

src/main/java/caosdb/server/utils/WebinterfaceUtils.java

@@ -101,7 +101,8 @@ public class WebinterfaceUtils {
   WebinterfaceUtils(
       String host, String contextRoot, String publicDir, String route, String buildNumberFile) {
     this.host = host;
-    this.contextRoot = contextRoot;
+    this.contextRoot =
+        contextRoot != null ? contextRoot.replaceFirst("^/", "").replaceFirst("/$", "") : null;
     this.publicDir = publicDir;
     this.route = route;
     this.buildNumberFile = getPublicRootPath().resolve(buildNumberFile);