Use sourceRegistry from deps.yaml for sorbet/drctl in ctst Dockerfile

The ctst Dockerfile hardcoded ghcr.io/scality as the registry for sorbet
and drctl images, ignoring the sourceRegistry field in deps.yaml. This
meant changing sourceRegistry (e.g. to a playground fork) had no effect
on CI test builds.

Extract the full image path (sourceRegistry + image) from deps.yaml
using yq in the workflow, and pass it as Docker build args. The
Dockerfile now uses SORBET_IMAGE and DRCTL_IMAGE ARGs with
backward-compatible defaults.

Issue: ZENKO-5220

Author: delthas

.github/workflows/end2end.yaml

@@ -425,8 +425,10 @@ jobs:
         working-directory: solution
         run: |-
           cat <<EOF >> $GITHUB_ENV
+          SORBET_IMAGE=$(yq eval '.sorbet | .sourceRegistry + "/" + .image' deps.yaml)
           SORBET_TAG=$(yq eval '.sorbet.tag' deps.yaml)
-          DRCTL_TAG=$(yq eval .drctl.tag deps.yaml)
+          DRCTL_IMAGE=$(yq eval '.drctl | .sourceRegistry + "/" + .image' deps.yaml)
+          DRCTL_TAG=$(yq eval '.drctl.tag' deps.yaml)
           EOF
       - name: Build and push CI image
         uses: docker/build-push-action@v5
@@ -437,7 +439,9 @@ jobs:
           secrets: |
             GIT_AUTH_TOKEN=${{ steps.app-token.outputs.token }}
           build-args: |
+            SORBET_IMAGE=${{ env.SORBET_IMAGE }}
             SORBET_TAG=${{ env.SORBET_TAG }}
+            DRCTL_IMAGE=${{ env.DRCTL_IMAGE }}
             DRCTL_TAG=${{ env.DRCTL_TAG }}
           tags: "${{ env.E2E_CTST_IMAGE_NAME }}:${{ env.E2E_IMAGE_TAG }}"
           cache-from: type=gha,scope=end2end-ctst

tests/ctst/Dockerfile

@@ -1,8 +1,10 @@
+ARG SORBET_IMAGE=ghcr.io/scality/sorbet
 ARG SORBET_TAG=latest
+ARG DRCTL_IMAGE=ghcr.io/scality/zenko-drctl
 ARG DRCTL_TAG=latest
 
-FROM ghcr.io/scality/sorbet:$SORBET_TAG AS sorbet
-FROM ghcr.io/scality/zenko-drctl:$DRCTL_TAG AS drctl
+FROM $SORBET_IMAGE:$SORBET_TAG AS sorbet
+FROM $DRCTL_IMAGE:$DRCTL_TAG AS drctl
 
 FROM node:24.14.0-bookworm-slim