feat: add workflow cleanup

.forgejo/workflows/docker-publish-semantic.yml

@@ -145,3 +145,13 @@ jobs:
             $(jq -cr '.tags | map("-t " + .) | join(" ")' <<< "$DOCKER_METADATA_OUTPUT_JSON") \
             ${{ env.REGISTRY }}/${{ env.CACHE_IMAGE }}:platform-semantic-amd64 \
             ${{ env.REGISTRY }}/${{ env.CACHE_IMAGE }}:platform-semantic-arm64
+
+      - name: Delete intermediate platform tags
+        run: |
+          CACHE_ENCODED=$(echo "${{ env.CACHE_IMAGE }}" | sed 's|/|%2F|g')
+          for tag in platform-semantic-amd64 platform-semantic-arm64; do
+            curl -s -X DELETE \
+              -H "Authorization: token ${{ secrets.REGISTRY_TOKEN }}" \
+              "https://${{ env.REGISTRY }}/api/v1/packages/${{ github.repository_owner }}/container/${CACHE_ENCODED}/${tag}" \
+              && echo "Deleted ${tag}" || echo "Failed to delete ${tag} (ignored)"
+          done