ci: initial experiment with ci build

.drone.yml

@@ -0,0 +1,31 @@
+---
+kind: pipeline
+type: docker
+name: default
+
+steps:
+  - name: build
+    image: node:16.18-bullseye
+    commands:
+      - apt-get update
+      - apt-get install -y cmake jq zip
+      - ./scripts/build-wasm.sh
+      - npm ci
+      - npm run test
+      - ./scripts/build-and-package.sh modern
+      - ./scripts/build-and-package.sh legacy
+      - ./scripts/build-and-package.sh extension
+      - sha256sum *.zip > sha256sum.txt
+
+  - name: upload
+    image: plugins/s3
+    settings:
+      bucket: um-web
+      access_key:
+        from_secret: S3_ACCESS_KEY
+      secret_key:
+        from_secret: S3_SECRET_KEY
+      source: |
+        *.zip
+        sha256sum.txt
+      target: /${DRONE_COMMIT_BRANCH}-latest