Fix wait-for-hydra: redirect debug echo to stderr

The debug echo inside poll_github() was captured by the command
substitution `conclusion=$(poll_github)`, making `conclusion` a
multi-line string that never matched the `success)` or `failure)`
patterns in the case statement. This caused the action to always
fall through to the `*` wildcard and wait until timeout.

Redirect both debug echo lines to stderr (`>&2`) so only the
actual gh api result is captured in the return value.

Author: angerman

wait-for-hydra/support/wait.sh

@@ -49,15 +49,17 @@ check_timeout() {
 
 poll_github() {
     if [ -n "$CHECK" ]; then
-        echo "Querying: gh api repos/$GITHUB_REPOSITORY/commits/$RELEVANT_SHA/check-runs --paginate --jq '...select(.name == \"$CHECK\")...'"
+        # Debug output to stderr so it doesn't pollute the captured result.
+        echo "Querying: gh api repos/$GITHUB_REPOSITORY/commits/$RELEVANT_SHA/check-runs --paginate --jq '...select(.name == \"$CHECK\")...'" >&2
         # Use tail -1 to handle paginated results that may concatenate
         # multiple values; take the last (most recent) non-empty line.
         gh api "repos/$GITHUB_REPOSITORY/commits/$RELEVANT_SHA/check-runs" \
             --paginate \
             --jq ".check_runs[] | select(.name == \"$CHECK\") | .conclusion" \
             | tail -1
     else
-        echo "Querying: gh api repos/$GITHUB_REPOSITORY/commits/$RELEVANT_SHA/status --paginate --jq '...select(.context == \"$STATUS\")...'"
+        # Debug output to stderr so it doesn't pollute the captured result.
+        echo "Querying: gh api repos/$GITHUB_REPOSITORY/commits/$RELEVANT_SHA/status --paginate --jq '...select(.context == \"$STATUS\")...'" >&2
         gh api "repos/$GITHUB_REPOSITORY/commits/$RELEVANT_SHA/status" \
             --paginate \
             --jq ".statuses[] | select(.context == \"$STATUS\") | .state" \