fix: use $HOME for skopeo credentials for rootless use

templates/gitlab-ci-docker.yml

@@ -347,9 +347,9 @@ stages:
     fi
 
     # Create the configuration file for Skopeo
-    mkdir -p /skopeo/.docker
-    echo "${docker_snapshot_config_json}" > /skopeo/.docker/src-config.json
-    echo "${docker_release_config_json}" > /skopeo/.docker/dest-config.json
+    mkdir -p "$HOME/skopeo/.docker"
+    echo "${docker_snapshot_config_json}" > "$HOME/skopeo/.docker/src-config.json"
+    echo "${docker_release_config_json}" > "$HOME/skopeo/.docker/dest-config.json"
 
     log_info "Docker authentication configured for \\e[33;1m${docker_snapshot_registry_host}\\e[0m"
   }
@@ -788,9 +788,9 @@ docker-publish:
         log_warn "\\e[93mYou should consider distinguishing snapshot and release images as they do not differ. Skipping publish phase as image has already been created by previous job.\\e[0m"
         exit 0
       fi
-      skopeo copy --src-authfile /skopeo/.docker/src-config.json --dest-authfile /skopeo/.docker/dest-config.json ${DOCKER_PUBLISH_ARGS} docker://$DOCKER_SNAPSHOT_IMAGE docker://$DOCKER_RELEASE_IMAGE
+      skopeo copy --src-authfile $HOME/skopeo/.docker/src-config.json --dest-authfile $HOME/skopeo/.docker/dest-config.json ${DOCKER_PUBLISH_ARGS} docker://$DOCKER_SNAPSHOT_IMAGE docker://$DOCKER_RELEASE_IMAGE
       log_info "Well done your image is published and can be downloaded by doing: docker pull $DOCKER_RELEASE_IMAGE"
-    - docker_digest=$(skopeo inspect --authfile /skopeo/.docker/dest-config.json --format='{{ .Digest }}' "docker://$DOCKER_RELEASE_IMAGE")
+    - docker_digest=$(skopeo inspect --authfile $HOME/skopeo/.docker/dest-config.json --format='{{ .Digest }}' "docker://$DOCKER_RELEASE_IMAGE")
     - docker_repository=${DOCKER_RELEASE_IMAGE%:*}
     - docker_tag=${DOCKER_RELEASE_IMAGE##*:}
     - echo "docker_image=$DOCKER_RELEASE_IMAGE" > docker.env