fix: bust Docker cache for plugin layer on each build

Use github.run_id as QWEN3VL_CACHE_BUST build arg to ensure the
plugin pip install always fetches the latest code from main.

Author: johannhartmann

.github/workflows/images-mayflower-docling-ocr-qwen3vl.yml

@@ -76,6 +76,7 @@ jobs:
           build-args: |
             BASE_IMAGE=${{ github.event.inputs.base_image || 'ghcr.io/docling-project/docling-serve-cu128:main' }}
             QWEN3VL_PLUGIN_REF=${{ github.event.inputs.plugin_ref || 'main' }}
+            QWEN3VL_CACHE_BUST=${{ github.run_id }}
 
       - name: Generate artifact attestation
         uses: actions/attest-build-provenance@v1

Containerfile.mayflower-qwen3vl

@@ -8,6 +8,9 @@ USER 0
 
 ENV PIP_DISABLE_PIP_VERSION_CHECK=1
 
+# Cache-bust arg: change to force re-install of plugin
+ARG QWEN3VL_CACHE_BUST=1
+
 RUN /opt/app-root/bin/python -m pip install --no-cache-dir \
     "git+${QWEN3VL_PLUGIN_REPO}@${QWEN3VL_PLUGIN_REF}" && \
     /opt/app-root/bin/python -c "from docling_ocr_qwen3vl.options import DEFAULT_QWEN3VL_MODEL_REPO_ID; print('default_model_repo_id=', DEFAULT_QWEN3VL_MODEL_REPO_ID)"