[supervisor] openssh: fix build for new leeway version

Author: geropl

components/supervisor/openssh/BUILD.yaml

@@ -5,7 +5,7 @@ packages:
       - :docker-build
     config:
       commands:
-        - ["sh", "-c", "find . | grep layer.tar | while read f; do tar xfv $f; done"]
+        - ["sh", "-c","TARFILE=$(cat ./components-supervisor-openssh--docker-build/manifest.json | jq -r '.[].Layers[]') && tar xvf ./components-supervisor-openssh--docker-build/$TARFILE"]
         - ["rm", "-rf", "components-supervisor-openssh--docker-build"]
   - name: docker-build
     type: docker