Adapt registry deploy jobs for shell prod runner

.gitlab-ci.yml

@@ -88,11 +88,17 @@ postgres-readiness:
 .docker_build:
   tags:
     - call-center-prod
+  variables:
+    DOCKER_HOST: ""
+    DOCKER_TLS_VERIFY: ""
+    DOCKER_CERT_PATH: ""
+    DOCKER_TLS_CERTDIR: ""
   image: docker:27
   services:
     - name: docker:27-dind
       alias: docker
   before_script:
+    - command -v docker >/dev/null
     - echo "$CI_REGISTRY_PASSWORD" | docker login "$CI_REGISTRY" -u "$CI_REGISTRY_USER" --password-stdin
   rules:
     - if: '$ENABLE_REGISTRY_BUILD == "1" && $CI_COMMIT_BRANCH == $CI_DEFAULT_BRANCH'
@@ -152,7 +158,8 @@ deploy-production:
   environment:
     name: production
   before_script:
-    - apk add --no-cache openssh-client rsync
+    - command -v ssh >/dev/null
+    - command -v rsync >/dev/null
     - mkdir -p ~/.ssh
     - chmod 700 ~/.ssh
     - printf '%s\n' "$DEPLOY_SSH_PRIVATE_KEY" > ~/.ssh/id_ed25519