Adds a couple build args to force pikepdf to rebuild dependent wheels if the versions change

docker-builders/Dockerfile.frontend

@@ -1,14 +0,0 @@
-# This Dockerfile compiles the frontend
-# Inputs: None
-
-FROM node:16-bullseye-slim AS compile-frontend
-
-COPY ./src /src/src
-COPY ./src-ui /src/src-ui
-
-WORKDIR /src/src-ui
-RUN set -eux \
-  && npm update npm -g \
-  && npm ci --omit=optional
-RUN set -eux \
-  && ./node_modules/.bin/ng build --configuration production

docker-builders/Dockerfile.pikepdf

@@ -18,6 +18,10 @@ LABEL org.opencontainers.image.description="A intermediate image with pikepdf wh
 
 ARG DEBIAN_FRONTEND=noninteractive
 ARG PIKEPDF_VERSION
+# These not not used, but will still bust the cache if one changes
+# Otherwise, the main image will try to build thing (and fail)
+ARG PILLOW_VERSION
+ARG LXML_VERSION
 
 ARG BUILD_PACKAGES="\
   build-essential \