Fix CI

.woodpecker/test.yaml

@@ -2,10 +2,9 @@ when:
   - event: push
     branch: master
 
-image: debian
-
 steps:
   - name: install-dependencies
+    image: debian
     commands:
       - apt update
       - apt install libcmocka-dev -y
@@ -13,9 +12,11 @@ steps:
       - apt install make -y
 
   - name: build-tests
+    image: debian
     commands:
       - make -j$(nproc) test/test.elf
 
   - name: run-tests
+    image: debian
     commands:
       - ./test/test.elf