Update .gitlab-ci.yml file for automatic doc build

.gitlab-ci.yml

 stages:
-    - static
   - dynamic
 
 default:
   tags:
     - podman
 
-static-copy:
-    stage: static
-    image: harbor.wolke.img.univie.ac.at/podman/alpine-sshpass:latest
-    when: manual
-    script:
-        - ls ./Documentation/html/
-        - sshpass -p "$WOLKE_PASSWORD" rsync -autv --delete -e "ssh -o StrictHostKeyChecking=no" ./Documentation/html/* "$WOLKE_USER@wolke.img.univie.ac.at:/var/www/flexpart/flexextract"
-
 build:
   image: harbor.wolke.img.univie.ac.at/podman/flexextract_sphinx:latest
   stage: dynamic
@@ -29,6 +20,8 @@ build:
 deploy:
   stage: dynamic
   image: harbor.wolke.img.univie.ac.at/podman/alpine-sshpass:latest
+  rules:
+    - if: '$CI_COMMIT_REF_NAME == "master"'
   needs:
     - build
   script: