Add drone config

.drone.yml

@@ -0,0 +1,40 @@
+kind: pipeline
+name: build
+
+trigger:
+  branch:
+    - master
+  event:
+    - push
+
+steps:
+  - name: build
+    image: node:12
+    pull: true
+    group: build-static
+    commands:
+      - yarn --production=false
+      - yarn build
+
+  - name: static
+    image: kolaente/zip
+    pull: true
+    commands:
+      - zip -r vikunja-theme.zip archetypes/ layouts/ static/ theme.toml
+    depends_on: [ build ]
+
+  - name: release
+    image: plugins/s3:1
+    pull: true
+    settings:
+      bucket: vikunja-releases
+      access_key:
+        from_secret: aws_access_key_id
+      secret_key:
+        from_secret: aws_secret_access_key
+      endpoint: https://s3.fr-par.scw.cloud
+      region: fr-par
+      path_style: true
+      source: vikunja-theme.zip
+      target: /theme/
+    depends_on: [ static ]