fix: stabilize systemd deployment and release updates

scripts/test-update-fixture.sh

@@ -221,10 +221,14 @@ build_release() {
   local unit_prefix=${3:-new}
   local stage="$fixture/stage"
   mkdir -p "$fixture/release" "$stage/public" "$stage/ops"
-  "$REAL_OPENSSL" genpkey -algorithm RSA -pkeyopt rsa_keygen_bits:2048 \
-    -out "$fixture/private.pem" >/dev/null 2>&1
-  "$REAL_OPENSSL" pkey -in "$fixture/private.pem" -pubout \
-    -out "$fixture/release-public.pem" >/dev/null 2>&1
+  if [ ! -s "$WORK/fixture-private.pem" ]; then
+    "$REAL_OPENSSL" genpkey -algorithm RSA -pkeyopt rsa_keygen_bits:2048 \
+      -out "$WORK/fixture-private.pem" >/dev/null 2>&1
+    "$REAL_OPENSSL" pkey -in "$WORK/fixture-private.pem" -pubout \
+      -out "$WORK/fixture-public.pem" >/dev/null 2>&1
+  fi
+  cp "$WORK/fixture-private.pem" "$fixture/private.pem"
+  cp "$WORK/fixture-public.pem" "$fixture/release-public.pem"
   printf 'new application\n' > "$stage/app.jar"
   printf '<!doctype html><title>new</title>\n' > "$stage/public/index.html"
   printf '%s\n' "$version" > "$stage/VERSION"
@@ -681,17 +685,30 @@ assert_install_without_verified_cache_rejected() {
     || fail 'install without cache changed the active application'
 }
 
+printf '[update-fixture] success\n'
 assert_success_case
+printf '[update-fixture] identical-systemd-operations\n'
 assert_identical_systemd_operations_case
+printf '[update-fixture] path-watcher-failure\n'
 assert_update_path_failure_keeps_application_case
+printf '[update-fixture] rollback\n'
 assert_rollback_case
+printf '[update-fixture] incomplete-rollback-recovery-lock\n'
 assert_incomplete_rollback_requires_manual_recovery_case
+printf '[update-fixture] download-failure\n'
 assert_download_failure_case
+printf '[update-fixture] database-backup-failure\n'
 assert_database_failure_case
+printf '[update-fixture] unhealthy-baseline\n'
 assert_unhealthy_baseline_blocks_restart_case
+printf '[update-fixture] invalid-database-url\n'
 assert_invalid_database_url_blocks_restart_case
+printf '[update-fixture] symlink-request\n'
 assert_symlink_request_rejected
+printf '[update-fixture] missing-verified-cache\n'
 assert_install_without_verified_cache_rejected
+printf '[update-fixture] private-gitea\n'
 assert_private_gitea_release_case
+printf '[update-fixture] cross-origin-gitea\n'
 assert_cross_origin_gitea_browser_url_ignored
 printf 'Online update download, confirmation, success, rollback, failure, and unsafe-request fixtures passed\n'