set docker platform for cross-arch builds

Author: Mic92

.github/workflows/publish.yml

@@ -100,7 +100,7 @@ jobs:
           else
               ENTRYPOINT=
           fi
-          docker run -e CXXFLAGS -v $(pwd):/gha ${{ matrix.platform }}/alpine:edge ${ENTRYPOINT} sh -ec "cd /gha && sh ./build.sh"
+          docker run --platform ${{ matrix.platform }} -e CXXFLAGS -v $(pwd):/gha ${{ matrix.platform }}/alpine:edge ${ENTRYPOINT} sh -ec "cd /gha && sh ./build.sh"
       - name: Check binaries
         run: |
           cat <<EOF > check.sh
@@ -109,7 +109,7 @@ jobs:
           tar -xf ./dist/patchelf-*-*.tar.gz
           ./bin/patchelf --version
           EOF
-          docker run -v $(pwd):/gha ${{ matrix.platform }}/debian:unstable-slim sh -ec "cd /gha && sh ./check.sh"
+          docker run --platform ${{ matrix.platform }} -v $(pwd):/gha ${{ matrix.platform }}/debian:unstable-slim sh -ec "cd /gha && sh ./check.sh"
       - uses: actions/upload-artifact@v3
         with:
           name: patchelf