Add parameter to add additional docker tags

README.md

@@ -291,6 +291,23 @@ steps:
       - my-custom-plugin#v1.0.0:
 ```
 
+### Specifying tags to apply to the pushed Docker image
+
+The image is tagged with the cache key and`latest`.
+
+By specifying the `tags` parameter you can specify your own set of tags to apply to the image:
+
+```yaml
+steps:
+  - command: echo wow
+    plugins:
+      - seek-oss/docker-ecr-cache#v2.0.0:
+          tags:
+            - build-${BUILDKITE_BUILD_NUMBER}
+```
+
+These tags are applied *each time the plugin runs*, whether the image is newly built or already exists and was pulled.
+
 ### AWS ECR specific configuration
 
 #### Specifying an ECR repository name

hooks/pre-command

@@ -80,6 +80,17 @@ if ! docker pull "${image}:${tag}"; then
   docker push "${image}:latest"
 fi || echo "Not found"
 
+results=()
+read_list_property 'TAGS'
+if [ "${#result[*]}" != "0" ]; then
+  for extra_tag in ${result[@]+"${result[@]}"}; do
+    echo "--- Pushing extra tags"
+    echo " - ${extra_tag}"
+    docker tag "${image}:${tag}" "${image}:${extra_tag}"
+    docker push "${image}:${extra_tag}"
+  done
+fi
+
 # Support using https://github.com/buildkite-plugins/docker-buildkite-plugin without an image by default
 export ${export_env_variable}="${image}:${tag}"
 

plugin.yml

@@ -33,4 +33,6 @@ configuration:
       type: string
     region:
       type: string
+    tags:
+      type: [array, string]
   required: []