Drone caching

.drone.yml

@@ -1,35 +1,53 @@
 kind: pipeline
 name: default
+
+globals:
+  - &docker_settings
+    username:
+      from_secret: docker_username
+    password:
+      from_secret: docker_password
+    registry: quay.io
+    repo: quay.io/natlibfi/annif
+
 steps:
 
-  - name: build
+  - name: dry_run_build
     image: plugins/docker
     settings:
-      dockerfile: Dockerfile
-      username:
-        from_secret: docker_username
-      password:
-        from_secret: docker_password
-      registry: quay.io
-      repo: quay.io/natlibfi/annif
+      <<: *docker_settings
       tags: [dry-run-built]
+      cache_from:
+        - quay.io/natlibfi/annif:builder
+        - quay.io/natlibfi/annif:latest
       dry_run: true
     when:
       event:
       - push
       - pull_request
 
+  - name: build_and_publish_builder
+    image: plugins/docker
+    settings:
+      <<: *docker_settings
+      tags: [builder]
+      cache_from:
+        - quay.io/natlibfi/annif:builder
+      target: builder
+    when:
+      branch:
+      - master
+      event:
+      - push
+
   - name: build_and_publish
     image: plugins/docker
     settings:
-      dockerfile: Dockerfile
-      username:
-        from_secret: docker_username
-      password:
-        from_secret: docker_password
-      registry: quay.io
-      repo: quay.io/natlibfi/annif
+      <<: *docker_settings
       tags: [latest]
+      cache_from:
+        - quay.io/natlibfi/annif:builder
+        - quay.io/natlibfi/annif:latest
     when:
       branch:
       - master
@@ -39,13 +57,7 @@ steps:
   - name: build_publish_and_tag_with_release_version
     image: plugins/docker
     settings:
-      dockerfile: Dockerfile
-      username:
-        from_secret: docker_username
-      password:
-        from_secret: docker_password
-      registry: quay.io
-      repo: quay.io/natlibfi/annif
+      <<: *docker_settings
       auto_tag: true
     when:
       branch: