don't know

.woodpecker/main.yml

@@ -38,7 +38,7 @@ pipeline:
       - ORGANIZATION=containers
       - REPO=matrix-service-synapse
       - BUILD_ARGS="PYTHON_VERSION=3.10"
-      - DOCKERFILE="docker/Dockerfile"
+      - DOCKERFILE=docker/Dockerfile
       - CONTEXT=.
     commands:
       - export DOCKER_BUILDKIT=1
@@ -50,6 +50,6 @@ pipeline:
         -t $REGISTRY/$ORGANIZATION/$REPO:latest
         --pull
         --build-arg $BUILD_ARGS
-        -f $DOCKERFILE
+        -f ${DOCKERFILE}
         $CONTEXT
       - docker push -a $REGISTRY/$ORGANIZATION/$REPO