File suffix support for CF_API_KEY (#3489)

scripts/start-deployAutoCF

@@ -21,9 +21,20 @@ set -eu
 : "${CF_DOWNLOADS_REPO=$([ -d /downloads ] && echo '/downloads' || echo '')}"
 : "${CF_MODPACK_MANIFEST:=}"
 : "${CF_API_CACHE_DEFAULT_TTL:=}" # as ISO-8601 duration, such as P2D or PT12H
+: "${CF_API_KEY_FILE:=}" # Path to file containing CurseForge API key
 
 resultsFile=/data/.install-curseforge.env
 
+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
+
 isDebugging && set -x
 
 ensureRemoveAllModsOff "MODPACK_PLATFORM=AUTO_CURSEFORGE"