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

.github/workflows/installer-library.yml

@@ -50,6 +50,11 @@ jobs:
         uses: actions/setup-python@v4
         with:
           python-version: "3.9"
+      -
+        name: Install jq
+        run: |
+          sudo apt-get update
+          sudo apt-get install jq
       -
         name: Setup qpdf image
         id: qpdf-setup
@@ -86,6 +91,18 @@ jobs:
           echo ${build_json}
 
           echo "jbig2enc-json=${build_json}" >> $GITHUB_OUTPUT
+      -
+        name: Setup other versions
+        id: cache-bust-setup
+        run: |
+          pillow_version=$(jq ".default.pillow.version" Pipfile.lock | sed 's/=//g' | sed 's/"//g')
+          lxml_version=$(jq ".default.lxml.version" Pipfile.lock | sed 's/=//g' | sed 's/"//g')
+
+          echo "Pillow is ${pillow_version}"
+          echo "lxml is ${lxml_version}"
+
+          echo "pillow-version=${pillow_version}" >> $GITHUB_OUTPUT
+          echo "lxml-version=${lxml_version}" >> $GITHUB_OUTPUT
 
     outputs:
 
@@ -97,7 +114,11 @@ jobs:
 
       psycopg2-json: ${{ steps.psycopg2-setup.outputs.psycopg2-json }}
 
-      jbig2enc-json: ${{ steps.jbig2enc-setup.outputs.jbig2enc-json}}
+      jbig2enc-json: ${{ steps.jbig2enc-setup.outputs.jbig2enc-json }}
+
+      pillow-version: ${{ steps.cache-bust-setup.outputs.pillow-version }}
+
+      lxml-version: ${{ steps.cache-bust-setup.outputs.lxml-version }}
 
   build-qpdf-debs:
     name: qpdf
@@ -145,3 +166,5 @@ jobs:
         REPO=${{ needs.prepare-docker-build.outputs.ghcr-repository }}
         QPDF_VERSION=${{ fromJSON(needs.prepare-docker-build.outputs.qpdf-json).version }}
         PIKEPDF_VERSION=${{ fromJSON(needs.prepare-docker-build.outputs.pikepdf-json).version }}
+        PILLOW_VERSION=${{ needs.prepare-docker-build.outputs.pillow-version }}
+        LXML_VERSION=${{ needs.prepare-docker-build.outputs.lxml-version }}