fix(shulker-operator): add back fallbacks on init scripts

packages/shulker-operator/assets/proxy-init-fs.sh

@@ -12,14 +12,14 @@ else
   cp "${SHULKER_CONFIG_DIR}/bungeecord-config.yml" "${SHULKER_PROXY_DATA_DIR}/config.yml"
 fi
 
-if [ ! -z "${SHULKER_PROXY_PLUGIN_URLS}" ]; then
+if [ ! -z "${SHULKER_PROXY_PLUGIN_URLS:-}" ]; then
   mkdir -p "${SHULKER_PROXY_DATA_DIR}/plugins"
   for plugin_url in ${SHULKER_PROXY_PLUGIN_URLS//;/ }; do
     (cd "${SHULKER_PROXY_DATA_DIR}/plugins" && wget "${plugin_url}")
   done
 fi
 
-if [ ! -z "${SHULKER_PROXY_PATCH_URLS}" ]; then
+if [ ! -z "${SHULKER_PROXY_PATCH_URLS:-}" ]; then
   for patch_url in ${SHULKER_PROXY_PATCH_URLS//;/ }; do
     (cd "${SHULKER_PROXY_DATA_DIR}" && wget "${patch_url}" -O - | tar -xzv)
   done

packages/shulker-operator/assets/proxy-probe-readiness.sh

@@ -1,4 +1,5 @@
 #!/bin/sh
+
 set -euo pipefail
 set -o xtrace
 

packages/shulker-operator/assets/server-init-fs.sh

@@ -10,18 +10,18 @@ if [ "${SHULKER_VERSION_CHANNEL}" == "Paper" ] || [ "${SHULKER_VERSION_CHANNEL}"
   cp "${SHULKER_CONFIG_DIR}/paper-global-config.yml" "${SHULKER_SERVER_CONFIG_DIR}/config/paper-global.yml"
 fi
 
-if [ ! -z "${SERVER_WORLD_URL}" ]; then
+if [ ! -z "${SERVER_WORLD_URL:-}" ]; then
   (cd "${SHULKER_SERVER_CONFIG_DIR}" && wget "${SERVER_WORLD_URL}" -O - | tar -xzv)
 fi
 
-if [ ! -z "${SHULKER_SERVER_PLUGIN_URLS}" ]; then
+if [ ! -z "${SHULKER_SERVER_PLUGIN_URLS:-}" ]; then
   mkdir -p "${SHULKER_SERVER_CONFIG_DIR}/plugins"
   for plugin_url in ${SHULKER_SERVER_PLUGIN_URLS//;/ }; do
     (cd "${SHULKER_SERVER_CONFIG_DIR}/plugins" && wget "${plugin_url}")
   done
 fi
 
-if [ ! -z "${SHULKER_SERVER_PATCH_URLS}" ]; then
+if [ ! -z "${SHULKER_SERVER_PATCH_URLS:-}" ]; then
   for patch_url in ${SHULKER_SERVER_PATCH_URLS//;/ }; do
     (cd "${SHULKER_SERVER_CONFIG_DIR}" && wget "${patch_url}" -O - | tar -xzv)
   done