update drone

.drone.yml

@@ -11,13 +11,13 @@ steps:
     repo: aaronriedel/egress-test
     tags:
       - latest
-      - ${DRONE_COMMIT_SHA:0:8}
+      - ${DRONE_BUILD_NUMBER}
 - name: bump tag in deployment-repo
   image: aaronriedel/kustomize-ci
   commands:
     - cd /deployment-repo
     - git clone https://git.ar21.de/aaron/egress-test-deployment.git .
-    - kustomize edit set image aaronriedel/egress-test=aaronriedel/egress-test:${DRONE_COMMIT_SHA:0:8}
+    - kustomize edit set image aaronriedel/egress-test=aaronriedel/egress-test:${DRONE_BUILD_NUMBER}
     - kustomize build -o /deployment-repo/ressources/deployment.yaml
   volumes:
   - name: deployment-repo
@@ -30,7 +30,7 @@ steps:
     path: /deployment-repo
     force: false
     commit: true
-    commit_message: "update image tag to ${DRONE_COMMIT_SHA:0:8}"
+    commit_message: "update image tag to ${DRONE_BUILD_NUMBER}"
     ssh_key:
       from_secret: GITEA_SSH_KEY
   volumes:
@@ -39,3 +39,10 @@ steps:
 volumes:
 - name: deployment-repo
   temp: {}
+when:
+  branch:
+    include:
+      - main
+  event:
+    include:
+      - push