CI: transfer old OpenCL images to Openwall repo

These are old OpenCL images with "back in the day" Intel drivers.
There is probably no way to rebuild these Docker images nowadays.

Signed-off-by: Claudio André <dev@claudioandre.slmail.me>

.circleci/config.yml

@@ -33,7 +33,7 @@ jobs:
   no-plugs:
     <<: *common_linux
     docker:
-      - image: claudioandre/john:opencl
+      - image: ghcr.io/openwall/john-ci:opencl
         environment:
           OMP_NUM_THREADS: 2
           PLUGS: "none"
@@ -51,7 +51,7 @@ jobs:
   encoding-opencl:
     <<: *common_linux
     docker:
-      - image: claudioandre/john:opencl18
+      - image: ghcr.io/openwall/john-ci:opencl18
         environment:
           OMP_NUM_THREADS: 2
           ENCODING_TEST: "opencl"