.github/workflows/ci-sage.yml: Use 'git archive' instead of 'build -s'

Author: mkoeppe

.github/workflows/ci-sage.yml

@@ -44,7 +44,7 @@ on:
 
 env:
   # Ubuntu packages to install so that the project's "make dist" can succeed
-  DIST_PREREQ:      libmpfr-dev
+  DIST_PREREQ:
   # Name of this project in the Sage distribution
   SPKG:             python_flint
   # Standard setting: Test the current beta release of Sage:
@@ -70,8 +70,8 @@ jobs:
       - run: pip install build
       - name: Run make dist, prepare upstream artifact
         run: |
-          (cd build/pkgs/${{ env.SPKG }}/src && python -m build --sdist) \
-          && mkdir -p upstream && cp build/pkgs/${{ env.SPKG }}/src/dist/*.tar.gz upstream/${{ env.SPKG }}-git.tar.gz \
+          (cd build/pkgs/${{ env.SPKG }}/src && git archive --format=tar.gz --prefix=${{ env.SPKG }}-git/ HEAD > ${{ env.SPKG }}-git.tar.gz) \
+          && mkdir -p upstream && cp build/pkgs/${{ env.SPKG }}/src/*.tar.gz upstream/${{ env.SPKG }}-git.tar.gz \
           && echo "sage-package create ${{ env.SPKG }} --version git --tarball ${{ env.SPKG }}-git.tar.gz --type=standard" > upstream/update-pkgs.sh \
           && if [ -n "${{ env.REMOVE_PATCHES }}" ]; then echo "(cd ../build/pkgs/${{ env.SPKG }}/patches && rm -f ${{ env.REMOVE_PATCHES }}; :)" >> upstream/update-pkgs.sh; fi \
           && ls -l upstream/