Add connection to fs auth provider, redirect not tested

pom.xml

@@ -72,6 +72,11 @@
             <groupId>org.springframework.boot</groupId>
             <artifactId>spring-boot-starter-oauth2-client</artifactId>
         </dependency>
+        <dependency>
+            <groupId>io.github.cdimascio</groupId>
+            <artifactId>dotenv-java</artifactId>
+            <version>3.0.0</version>
+        </dependency>
     </dependencies>
     <dependencyManagement>
         <dependencies>