Add Drone CI pipeline

.drone.yml

@@ -0,0 +1,10 @@
+kind: pipeline
+name: build
+
+steps:
+  - name: build docker image
+    image: docker
+    commands:
+      - docker build -t my-hmac-file-server .
+      - docker run -d -p 8080:8080 my-hmac-file-server
+      - docker ps  # Optional: To verify the container is running