Fix deprecated CI config

.woodpecker/check.yml

@@ -1,7 +1,7 @@
 labels:
   backend: local
 
-pipeline:
+steps:
 - name: flake check
   image: bash
   commands:
@@ -14,15 +14,15 @@ pipeline:
 
 - name: notify
   image: bash
-  secrets:
-  - source: matrix_roomid
-    target: room
-  - source: matrix_username
-    target: user
-  - source: matrix_password
-    target: pass
-  - source: matrix_homeserver
-    target: address
+  environment:
+    ADDRESS:
+      from_secret: matrix_homeserver
+    ROOM:
+      from_secret: matrix_roomid
+    USER:
+      from_secret: matrix_username
+    PASS:
+      from_secret: matrix_password
   commands:
   - nix run github:ambroisie/matrix-notifier
   when: