don't build for every branch push

.drone.yml

@@ -18,11 +18,19 @@ steps:
       - echo "machine git.itzana.me login $${GIT_USER} password $${GIT_PASS}" > ~/.netrc
       - chmod 600 ~/.netrc
       - make build-backend
+    when:
+      branch:
+        - master
+        - staging
 
   - name: build-validator
     image: clux/muslrust:1.86.0-stable
     commands:
       - make build-validator
+    when:
+      branch:
+        - master
+        - staging
 
   - name: build-frontend
     image: oven/bun:1.2.8
@@ -30,6 +38,10 @@ steps:
       - apt-get update
       - apt-get install make
       - make build-frontend
+    when:
+      branch:
+        - master
+        - staging
 
   - name: image-backend
     image: plugins/docker
@@ -137,6 +149,6 @@ steps:
         - pull_request
 ---
 kind: signature
-hmac: 4b66c6197f3d730605f9c52f90bb1970912d8a7765a11968640b924c0b01d4fc
+hmac: 9880a1bb4725c81e38b5d185bbfccaf70ddf8021299557d1815f78e78817c5e6
 
 ...