use matrix notation

.woodpecker/images.yaml

@@ -4,9 +4,9 @@ when:
     name: images
 
 steps:
-  "Build image":
+  'Build image':
     image: woodpeckerci/plugin-docker-buildx:4.2.0
-    secrets: [red_hat_dev_pw]
+    secrets: [RED_HAT_DEV_PW]
     settings:
       platforms: linux/arm64
       Dockerfile: docker/Dockerfile-ubi9
@@ -16,6 +16,8 @@ steps:
       username: pats22
       password:
         from_secret: dockerhub_token_pats22
+      build_args_from_env:
+        - RED_HAT_DEV_PW
     backend_options:
       kubernetes:
         resources:
@@ -26,4 +28,4 @@ steps:
             memory: 800Mi
             cpu: 1000m
         nodeSelector:
-          kubernetes.io/arch: 'arm64'
+          kubernetes.io/arch: 'arm64'