add ci/cd conf (drone)

.drone.yml

@@ -4,8 +4,33 @@ type: docker
 name: default
 
 steps:
-- name: build
-  image: deblan/devenv
-  commands:
-    - npm install
-    - npm run build
+  - name: dependencies
+    image: deblan/devenv
+    commands:
+      - npm install
+    when:
+      event:
+        - push
+
+  - name: build
+    image: deblan/devenv
+    volumes:
+      - name: artefacts
+        path: /artefacts
+    environment:
+      APP_CERTIFICATE:
+        from_secret: app_certificate
+    commands:
+      - mkdir -p "$HOME/.nextcloud/certificates"
+      - echo "$APP_CERTIFICATE" > "$HOME/.nextcloud/certificates/side_menu.key"
+      - export VERSION=$(grep "<version>" appinfo/info.xml | grep -o "[0-9]*\.[0-9]*\.[0-9]*" --color=never)
+      - export RELEASE_DIRECTORY="/artefacts/deblan/side_menu"
+      - make release
+    when:
+      branch:
+        - master
+
+volumes:
+  - name: artefacts
+    host:
+      path: /var/www/html/_artefacts