modify drone to brand commits before docker build

.drone.yml

@@ -9,6 +9,10 @@ globals:
     password:
       from_secret: REGISTRY_PASSWORD
 steps:
+  - name: brand commit before build
+    image: bash
+    commands:
+    - echo ${DRONE_COMMIT_SHA:0:7} > app/__commit__
   - name: build app-testing
     image: plugins/docker
     settings:
@@ -35,6 +39,10 @@ globals:
     password:
       from_secret: REGISTRY_PASSWORD
 steps:
+  - name: brand commit before build
+    image: bash
+    commands:
+    - echo ${DRONE_COMMIT_SHA:0:7} > app/__commit__
   - name: build-app-prod
     image: plugins/docker
     settings:
@@ -43,7 +51,6 @@ steps:
       dockerfile: ./Dockerfile
       tags: ["${DRONE_COMMIT_SHA:0:7}", "latest-prod"]
       <<: *docker_creds
-      
 trigger:
   branch:
   - master