feat: reverted to use shell and yq vs test class

Summary of changes:
- Reverted to use of shell commands and `yq` instead of CheckRock test
  class from chisme package.

NOTE: Use of bash shell commands significantly reduces maintability of
tox.ini

sklearnserver/tox.ini

@@ -27,10 +27,10 @@ deps =
 commands =
     # build and pack rock
     rockcraft pack
-    bash -c 'ROCK=$(python -c '\''from charmed_kubeflow_chisme.rock import CheckRock; \
-                    print(CheckRock("rockcraft.yaml").get_image_name())'\'') && \
-             VERSION=$(python -c '\''from charmed_kubeflow_chisme.rock import CheckRock; \
-                    print(CheckRock("rockcraft.yaml").get_version())'\'') && \
+    bash -c 'NAME=$(yq eval .name rockcraft.yaml) && \
+             VERSION=$(yq eval .version rockcraft.yaml) && \
+             ARCH=$(yq eval ".platforms | keys" rockcraft.yaml | awk -F " " '\''{ print $2 }'\'') && \
+             ROCK="$\{NAME\}_$\{VERSION\}_$\{ARCH\}" && \
              sudo skopeo --insecure-policy copy oci-archive:$ROCK.rock docker-daemon:$ROCK:$VERSION'
 
     # run rock tests
@@ -60,10 +60,10 @@ commands =
     # replace jinja2 templated value with yq safe placeholder
     sed -i "s/namespace: {{ namespace }}/namespace: YQ_SAFE/" {env:LOCAL_CHARM_DIR}/src/templates/configmap.yaml.j2
     # upload rock to docker and microk8s cache, replace charm's container with local rock reference
-    bash -c 'ROCK=$(python -c '\''from charmed_kubeflow_chisme.rock import CheckRock; \
-                    print(CheckRock("rockcraft.yaml").get_image_name())'\'') && \
-             VERSION=$(python -c '\''from charmed_kubeflow_chisme.rock import CheckRock; \
-                    print(CheckRock("rockcraft.yaml").get_version())'\'') && \
+    bash -c 'NAME=$(yq eval .name rockcraft.yaml) && \
+             VERSION=$(yq eval .version rockcraft.yaml) && \
+             ARCH=$(yq eval ".platforms | keys" rockcraft.yaml | awk -F " " '\''{ print $2 }'\'') && \
+             ROCK="$\{NAME\}_$\{VERSION\}_$\{ARCH\}" && \
              sudo skopeo --insecure-policy copy oci-archive:$ROCK.rock docker-daemon:$ROCK:$VERSION && \
              docker save $ROCK > $ROCK.tar && \
              microk8s ctr image import $ROCK.tar --digests=true && \