Update the CI/CD configuration to build the image.

.drone.yml

@@ -24,6 +24,20 @@ steps:
     commands:
       - mix test
 
+  - name: build the image
+    image: plugins/kaniko
+    settings:
+      username: kklochko
+      password:
+        from_secret: REGISTRY_PASSWORD
+      repo: git.kklochko.space/kklochko/decentralised_book_index
+      registry: git.kklochko.space
+      tags:
+        - latest
+        - ${DRONE_TAG}
+    when:
+      event: tag
+
 volumes:
 - name: mix
   temp: {}