Use --quiet when invoking brew

When `brew` is used by this action, it generates a bunch of warnings
which are picked up by the github actions capture system and shown for
end users. They are noisy and most of them are expected. It's better to
suppress them and do not alert users.

action.yml

@@ -82,15 +82,17 @@ runs:
           echo "PQ_LIB_DIR=$PG_LIBDIR" >> $GITHUB_ENV
 
         elif [ "$RUNNER_OS" == "macOS" ]; then
+          export HOMEBREW_NO_ENV_HINTS=1
           export HOMEBREW_NO_INSTALLED_DEPENDENTS_CHECK=1
           export HOMEBREW_NO_INSTALL_CLEANUP=1
           export HOMEBREW_NO_INSTALL_UPGRADE=1
-          brew install --skip-post-install postgresql@${{ inputs.postgres-version }}
+          brew install --quiet --skip-post-install postgresql@${{ inputs.postgres-version }}
 
           # Link PostgreSQL binaries from /usr/local/bin in order to make them
-          # available globally. The overwrite option is required since some
-          # GitHub runners come with preinstalled PostgreSQL binaries.
-          brew link --overwrite postgresql@${{ inputs.postgres-version }}
+          # available globally. Since some GitHub runners come with
+          # preinstalled PostgreSQL binaries, we have to unlink them first.
+          brew unlink --quiet postgresql@${{ inputs.postgres-version }}
+          brew link --quiet postgresql@${{ inputs.postgres-version }}
         fi
       shell: bash