Force gzip layer compression for Crossplane package parser compatibility

Kubernetes BuildKit driver defaults to zstd even with --push; explicitly
set compression=gzip,force-compression=true so Crossplane can parse the
package image layers.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Author: ericduranddd

.gitlab-ci.yml

@@ -62,7 +62,8 @@ build-image:
         --label CI_PIPELINE_ID="${CI_PIPELINE_ID}" \
         --label CI_JOB_ID="${CI_JOB_ID}" \
         --tag "${REGISTRY}/${IMAGE_NAME}:${IMAGE_TAG}" \
-        --metadata-file "${METADATA_FILE}" --push \
+        --metadata-file "${METADATA_FILE}" \
+        --output type=image,push=true,compression=gzip,force-compression=true \
         .
 
       ddsign sign "${REGISTRY}/${IMAGE_NAME}:${IMAGE_TAG}" --docker-metadata-file "${METADATA_FILE}"
@@ -128,7 +129,8 @@ build-release:
         --label CI_JOB_ID="${CI_JOB_ID}" \
         --annotation target=staging \
         --tag "${REGISTRY}/${IMAGE_NAME}:${IMAGE_TAG}" \
-        --metadata-file "${METADATA_FILE}" --push \
+        --metadata-file "${METADATA_FILE}" \
+        --output type=image,push=true,compression=gzip,force-compression=true \
         .
 
       ddsign sign "${REGISTRY}/${IMAGE_NAME}:${IMAGE_TAG}" --docker-metadata-file "${METADATA_FILE}"