enable temporary ssh-agent on windows

.github/workflows/msys2.yml

@@ -89,6 +89,7 @@ jobs:
           REMOTE_HOME: ${{ secrets.REMOTE_HOME }}
           SSH_PRIVATE_KEY: ${{ secrets.SSH_PRIVATE_KEY }}
         run: |
+          ssh-agent -a /tmp/.ssh-socket
           ssh-add - <<< "${SSH_PRIVATE_KEY}"
           cd /c/src
           MESON_PATH=/ucrt64/bin/meson NINJA_PATH=/ucrt64/bin/ninja AWS_CLI_PATH=/ucrt64/bin/aws zrythm-builds/scripts/make-pkg.sh windows10-msys windows-msys-prepare