Export environment variables properly

.github/workflows/release.yml

@@ -129,12 +129,12 @@ jobs:
           # install zlib, which is a dependency of APPLgrid but somehow missing
           brew install zlib
           # APPLgrid wants to be linked against zlib, and we need to find its static library via pkg-config
-          export PKG_CONFIG_PATH=$(find $(brew --cellar) -name '*.pc' -exec dirname {} + | sort -u | tr '\n' ':')
+          echo "PKG_CONFIG_PATH=$(find $(brew --cellar) -name '*.pc' -exec dirname {} + | sort -u | tr '\n' ':')" >> ${GITHUB_ENV}
           # manually compile APPLgrid, because we need the file `appl_igrid.h` and the files it includes, which are possibly generated
           export HOMEBREW_TEMP="$(pwd)"/tmp
           mkdir -p ${HOMEBREW_TEMP}
           brew install --build-from-source --keep-tmp --without-hoppet --without-lhapdf --without-root applgrid
-          export APPL_IGRID_DIR=$(find ${HOMEBREW_TEMP} -name appl_igrid.h -exec dirname {} +)
+          echo "APPL_IGRID_DIR=$(find ${HOMEBREW_TEMP} -name appl_igrid.h -exec dirname {} +)" >> ${GITHUB_ENV}
           # do not link against `gfortran`
           sed 's/-lgfortran//g' $(command -v applgrid-config) > applgrid-config.new
           mv applgrid-config.new $(command -v applgrid-config)