fix: stabilize systemd deployment and release updates

scripts/test-baota-start-fixture.sh

@@ -51,6 +51,10 @@ EOF
 cat > "$WORK/java" <<'SH'
 #!/usr/bin/env bash
 set -Eeuo pipefail
+if [ "${1:-}" = -version ]; then
+  printf 'openjdk version "17-fixture"\n' >&2
+  exit 0
+fi
 {
   printf 'cwd=%s\n' "$PWD"
   printf 'args=%s\n' "$*"
@@ -92,6 +96,34 @@ PID_RECORD=$(sed -n 's/^pid-record=//p' "$WORK/java.log")
 SELF_PID=$(sed -n 's/^self-pid=//p' "$WORK/java.log")
 [ "$PID_RECORD" = "$SELF_PID 424242" ] || fail 'PID file did not bind the PID to its proc start time'
 
+# systemd reads the root-only EnvironmentFile before dropping to User=kaidi.
+# The launcher must therefore be able to start with those files intentionally
+# unreadable by the service user.
+chmod 000 "$WORK/base.env" "$WORK/runtime.env"
+MOCK_JAVA_LOG="$WORK/preloaded.log" \
+PATH="$WORK/mock-bin:$PATH" \
+KAIDI_ENV_PRELOADED=true \
+KAIDI_JAVA_BIN="$WORK/java" \
+SPRING_PROFILES_ACTIVE=production \
+SERVER_ADDRESS=127.0.0.1 \
+SERVER_PORT=21000 \
+DB_URL='jdbc:mysql://db.fixture/kaidi_finance' \
+DB_USERNAME=fixture-user \
+DB_PASSWORD='fixture-password' \
+FIELD_ENCRYPTION_KEY=fixture-field-key \
+FILE_STORAGE_ROOT="$WORK/files" \
+FILE_STORAGE_TEMP="$WORK/tmp" \
+FINANCE_SETUP_ENABLED=false \
+FINANCE_UPDATE_ENABLED=true \
+FILE_SCANNER_ENABLED=false \
+KAIDI_PID_FILE="$WORK/state/preloaded.pid" \
+KAIDI_CONFIG_FILE="$WORK/base.env" \
+KAIDI_RUNTIME_ENV_FILE="$WORK/runtime.env" \
+  "$RELEASE/ops/baota-start.sh"
+grep -Fqx 'port=21000' "$WORK/preloaded.log" \
+  || fail 'launcher still depended on the root-only configuration files under systemd'
+chmod 0644 "$WORK/base.env" "$WORK/runtime.env"
+
 MOCK_JAVA_LOG="$WORK/explicit.log" \
 PATH="$WORK/mock-bin:$PATH" \
 KAIDI_JAVA_BIN="$WORK/java" \