drone: do not attempt to deploy pull requests

.drone.yml

@@ -98,6 +98,9 @@ steps:
     image: plugins/docker
     settings:
       registry: registry.itzana.me
+      tags:
+        - ${DRONE_BRANCH}-${DRONE_BUILD_NUMBER}
+        - ${DRONE_BRANCH}
       dockerfile: Containerfile
       context: .
     when:
@@ -108,6 +111,9 @@ steps:
     image: plugins/docker
     settings:
       registry: registry.itzana.me
+      tags:
+        - ${DRONE_BRANCH}-${DRONE_BUILD_NUMBER}
+        - ${DRONE_BRANCH}
       dockerfile: web/Containerfile
       context: web
     when:
@@ -118,6 +124,9 @@ steps:
     image: plugins/docker
     settings:
       registry: registry.itzana.me
+      tags:
+        - ${DRONE_BRANCH}-${DRONE_BUILD_NUMBER}
+        - ${DRONE_BRANCH}
       dockerfile: validation/Containerfile
       context: validation
     when:
@@ -137,6 +146,6 @@ steps:
       - pull_request
 ---
 kind: signature
-hmac: d83f247d4e529f2454a9e67a12db3d9cbec1d5b39c85571dc137c71f1d6adafd
+hmac: 77bce56a1dbe0ea24a348bebe7cb0357a2e0956a6d4a6ba9c8384daa8ff438fa
 
 ...