Tag each image with current datetime

.drone.yml

@@ -3,6 +3,11 @@ type: docker
 name: build
 
 steps:
+  - name: generate-tags
+    image: node
+    commands:
+      - echo -n "$(date +'%Y-%m-%d_%H-%M'), latest" > .tags
+
   - name: docker
     image: plugins/docker
     depends_on:
@@ -13,8 +18,6 @@ steps:
       password:
         from_secret: docker_password
       repo: kingofdog/pandoc-latex
-      tags:
-        - latest
   #- name: docker-arm64
   #  image: plugins/docker
   #  depends_on: