add debugging secret

Dockerfile

@@ -21,6 +21,8 @@ WORKDIR /code
 COPY ./requirements.txt /code/requirements.txt
 RUN pip install --no-cache-dir --upgrade -r /code/requirements.txt
 
+RUN --mount=type=secret,id=GREETING,mode=0444,required=true cat /run/secrets/GREETING 
+
 COPY ./downloadartifact.py /code
 RUN --mount=type=secret,id=GH_TOKEN,mode=0444,required=true ls -ltrah /run/secrets/GH_TOKEN 
 RUN --mount=type=secret,id=GH_TOKEN,mode=0444,required=true \