Use grep for more reliable JSON value detection in test script

- Replace Bash pattern matching with grep for more consistent testing
- Add more explicit comments about detecting sealed/unsealed status
- Improve overall reliability of the test script

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

test_docker.sh

@@ -118,7 +118,8 @@ fi
 # Verify Vault is unsealed
 vault_status=$(docker-compose exec -T vault env VAULT_ADDR=http://127.0.0.1:8200 vault status -format=json 2>/dev/null || echo '{"sealed": true}')
 
-if [[ "$vault_status" == *'"sealed":false'* ]]; then
+# Check if Vault is unsealed by looking for "sealed":false - needs jq for reliable parsing
+if echo "$vault_status" | grep -q '"sealed":false'; then
   log "INFO" "Vault is properly unsealed"
 else
   log "ERROR" "Vault is still sealed"
@@ -143,7 +144,7 @@ sleep 5
 # Verify Vault is sealed after restart (it should be)
 vault_status=$(docker-compose exec -T vault env VAULT_ADDR=http://127.0.0.1:8200 vault status -format=json 2>/dev/null || echo '{"sealed": true}')
 
-if [[ "$vault_status" == *'"sealed":true'* ]]; then
+if echo "$vault_status" | grep -q '"sealed":true'; then
   log "INFO" "Vault is correctly sealed after restart"
 else
   log "WARN" "Vault is not sealed after restart - this is unexpected"
@@ -166,7 +167,7 @@ docker-compose run -e VAULT_ADDR=http://vault:8200 \
 # Verify Vault is unsealed now
 vault_status=$(docker-compose exec -T vault env VAULT_ADDR=http://127.0.0.1:8200 vault status -format=json 2>/dev/null || echo '{"sealed": true}')
 
-if [[ "$vault_status" == *'"sealed":false'* ]]; then
+if echo "$vault_status" | grep -q '"sealed":false'; then
   log "INFO" "Vault was successfully unsealed after restart"
 else
   log "ERROR" "Vault is still sealed after restart"