drone: do not attempt to deploy pull requests

.drone.yml

@@ -26,7 +26,7 @@ steps:
         - master
         - staging
       event:
-      - push
+        - push
 
   - name: frontend
     image: plugins/docker
@@ -47,7 +47,7 @@ steps:
         - master
         - staging
       event:
-      - push
+        - push
 
   - name: validator
     image: plugins/docker
@@ -68,7 +68,7 @@ steps:
         - master
         - staging
       event:
-      - push
+        - push
 
   - name: deploy
     image: argoproj/argocd:latest
@@ -91,7 +91,7 @@ steps:
         - master
         - staging
       event:
-      - push
+        - push
 
 # pr dry run
   - name: api-pr
@@ -103,9 +103,10 @@ steps:
         - ${DRONE_BRANCH}
       dockerfile: Containerfile
       context: .
+      dry_run: true
     when:
       event:
-      - pull_request
+        - pull_request
 
   - name: frontend-pr
     image: plugins/docker
@@ -116,6 +117,7 @@ steps:
         - ${DRONE_BRANCH}
       dockerfile: web/Containerfile
       context: web
+      dry_run: true
     when:
       event:
       - pull_request
@@ -129,9 +131,10 @@ steps:
         - ${DRONE_BRANCH}
       dockerfile: validation/Containerfile
       context: validation
+      dry_run: true
     when:
       event:
-      - pull_request
+        - pull_request
 
   - name: build-pr
     image: alpine
@@ -143,9 +146,9 @@ steps:
       - validator-pr
     when:
       event:
-      - pull_request
+        - pull_request
 ---
 kind: signature
-hmac: 77bce56a1dbe0ea24a348bebe7cb0357a2e0956a6d4a6ba9c8384daa8ff438fa
+hmac: de6ca0165b6f0dc12828d1665be1646b591887735562714781401f276395f72c
 
 ...