add ci build

ci/concourse/build.yaml

@@ -0,0 +1,25 @@
+resources:
+  - name: content
+    type: git
+    source:
+      uri: https://xbib.org/gogs/joerg/content
+jobs:
+  - name: build
+    plan:
+      - get: content
+        trigger: true
+      - task: build
+        config:
+          platform: linux
+          image_resource:
+            type: docker-image
+            source:
+              repository: fl.hbz-nrw.de
+              image: centos-gradle
+          inputs:
+            - name: content
+          run:
+            dir: content
+            path: gradle
+            args:
+              - build