It is called archmirror, not mirror

Signed-off-by: Wachtl Enterprises LLC <tyrolyean@escpe.net>

.forgejo/workflows/build_pkg.yml

@@ -17,7 +17,7 @@ jobs:
           copy_all_sources: true
       - name: Copy to mirror
         run: |
-          echo "${{ secrets.SSH_MIRROR }}" > ~/.ssh/id_ed25519
+          echo "${{ secrets.SSH_ARCHMIRROR }}" > ~/.ssh/id_ed25519
           echo "${{ vars.SIGNING_HOST }} ${{ vars.SIGNING_HOST_SSHKEY }}" >> ~/.ssh/known_hosts
           chmod -R 700 ~/.ssh
           sftp ${{ vars.SIGNING_USER }}@${{ vars.SIGNING_HOST }} <<EOF