workflows: remove parallel build

Signed-off-by: Patrick Stephens <[email protected]>

Author: Patrick Stephens

.github/workflows/call-build-images.yaml

@@ -403,7 +403,7 @@ jobs:
 
       - name: Build the production images
         run: |
-          docker build -t ${{ inputs.registry }}/${{ inputs.image }}:windows-${{ matrix.windows-base-version }}-${{ inputs.version }} --build-arg FLB_NIGHTLY_BUILD=${{ inputs.unstable }} --build-arg WINDOWS_VERSION=ltsc${{ matrix.windows-base-version }} --build-arg BUILD_PARALLEL=4 -f ./dockerfiles/Dockerfile.windows .
+          docker build -t ${{ inputs.registry }}/${{ inputs.image }}:windows-${{ matrix.windows-base-version }}-${{ inputs.version }} --build-arg FLB_NIGHTLY_BUILD=${{ inputs.unstable }} --build-arg WINDOWS_VERSION=ltsc${{ matrix.windows-base-version }} -f ./dockerfiles/Dockerfile.windows .
           docker push ${{ inputs.registry }}/${{ inputs.image }}:windows-${{ matrix.windows-base-version }}-${{ inputs.version }}
 
         # We cannot use this action as it requires privileged mode