ci: POSIX-safe example-validation loop (trixie-slim sh is dash, no shopt)

.forgejo/workflows/validate.yml

@@ -60,13 +60,12 @@ jobs:
       - name: Validate example payloads against their schemas (if any)
         working-directory: ${{ github.workspace }}
         run: |
-          set -euo pipefail
+          set -eu
           export NODE_PATH=/tmp/ajv/node_modules
-          shopt -s nullglob
-          for schema in $(find schemas -type f -name '*.json'); do
+          find schemas -type f -name 'v*.json' -print | while IFS= read -r schema; do
             dir="$(dirname "$schema")/examples"
             [ -d "$dir" ] || continue
-            for example in "$dir"/*.json; do
+            find "$dir" -type f -name '*.json' -print | while IFS= read -r example; do
               echo "--- validate example $example against $schema"
               node /tmp/ajv/node_modules/.bin/ajv validate --spec=draft2020 -c=ajv-formats -s "$schema" -d "$example"
             done