File suffix support for CF_API_KEY (#3489)

scripts/start-setupModpack

@@ -11,8 +11,19 @@ set -e -o pipefail
 : "${PLUGINS_FILE:=}"
 : "${REMOVE_OLD_MODS_DEPTH:=1} "
 : "${REMOVE_OLD_MODS_INCLUDE:=*.jar,*-version.json}"
+: "${CF_API_KEY_FILE:=}" # Path to file containing CurseForge API key
 sum_file=/data/.generic_pack.sum
 
+if [[ -n ${CF_API_KEY_FILE} ]]; then
+  if [[ -r "${CF_API_KEY_FILE}" ]]; then
+    CF_API_KEY="$(cat "${CF_API_KEY_FILE}")"
+    export CF_API_KEY
+  else
+    logError "CF_API_KEY_FILE is not readable: ${CF_API_KEY_FILE}"
+    exit 1
+  fi
+fi
+
 # shellcheck source=start-utils
 . "${SCRIPTS:-/}start-utils"
 isDebugging && set -x