fix: handle non-passphrase SSH prompts in askpass script

Add early exit for SSH prompts that aren't requesting passphrase input.
This prevents the askpass script from attempting to provide a passphrase
for other SSH prompts like host key verification.

Assisted-by: Claude Sonnet 4.5
Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>
Signed-off-by: Ihor Vinokur <ivinokur@redhat.com>

Author: vinokurig

pkg/provision/workspace/ssh-askpass.sh

@@ -1,4 +1,9 @@
 #!/bin/sh
+# Only handle passphrase prompts - exit silently for other prompts (e.g., HTTPS git repo username/password request)
+case "$1" in
+  \"Enter passphrase for key \'*) ;;
+  *) exit 0 ;;
+esac
 PASSPHRASE_FILE_PATH="/etc/ssh/passphrase"
 if [ ! -f $PASSPHRASE_FILE_PATH ]; then
     echo "Error: passphrase file is missing in the '/etc/ssh/' directory" 1>&2