added GitLab CI config

.gitlab-ci.yml

+stages:
+  - build
+  - deploy
+
+# Stage: build
+##############################################################################
+
+build:
+  stage: build
+  artifacts:
+    paths:
+      - build
+  script:
+    - make build
+  tags:
+    - docker
+  image: jekyll/jekyll:builder
+
+# Stage: deploy
+##############################################################################
+
+upload:
+  stage: deploy
+  script:
+    - make deploy
+  dependencies:
+    - build
+  tags:
+    - shell
\ No newline at end of file

Makefile

+#DEPLOY_USER ?= fine-aachenadmin
+#DEPLOY_PASS ?= $(shell pass rwth/acs/fein-webspace)
+#DEPLOY_URL ?= https://web-upload.rwth-aachen.de/fine-aachen/new/
+
+DEPLOY_USER ?= acs
+DEPLOY_HOST ?= villas.fein-aachen.org
+DEPLOY_PATH ?= /var/www/villas/website/
+
+SRCDIR := $(realpath $(dir $(lastword $(MAKEFILE_LIST))))
+BUILDDIR ?= $(SRCDIR)/build
+
+RSYNC_OPTS ?= --archive --delete --verbose --progress --ignore-missing-args --copy-links --chown $(DEPLOY_USER):$(DEPLOY_USER)
+DAVIX_OPTS ?= -r10 --userlogin $(DEPLOY_USER) --userpass $(DEPLOY_PASS)
+JEKYLL_OPTS ?= -s $(SRCDIR) -d $(BUILDDIR)
+
 build:
-	jekyll build
+	jekyll build $(JEKYLL_OPTS)
+
+deploy: deploy-rsync
+
+deploy-rsync:
+	rsync $(RSYNC_OPTS) $(BUILDDIR) $(DEPLOY_USER)@$(DEPLOY_HOST):$(DEPLOY_PATH)
 
-deploy: build
-	rsync -a --delete _site/ root@villas.fein-aachen.org:/var/www/villas/website/
+deploy-webdav:
+	# Davix returns 255 for some reason...
+	davix-put $(DAVIX_OPTS) $(BUILDDIR)/ $(DEPLOY_URL) || true
 
-.PHONY: build deploy
\ No newline at end of file
+.PHONY: build deploy deploy-rsync deploy-webdav
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