Retain declared version for placeholder usage (#2486)

docs/configuration/server-properties.md

@@ -22,7 +22,7 @@ The following options are available for placeholders:
 
 : The `FMT` string is processed by [Java's DateTimeFormatter](https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/time/format/DateTimeFormatter.html) and the current date/time is formatted.
 
-Any declared or resolved environment variable may be referenced, such as `VERSION` and `TYPE`. Additionally, [Modrinth](../types-and-platforms/mod-platforms/modrinth-modpacks.md) and [Auto CurseForge](../types-and-platforms/mod-platforms/auto-curseforge.md) modpacks will expose the environment variables `MODPACK_NAME` and `MODPACK_VERSION`.
+Any declared or resolved environment variable may be referenced, such as `VERSION` and `TYPE`. Additionally, [Modrinth](../types-and-platforms/mod-platforms/modrinth-modpacks.md) and [Auto CurseForge](../types-and-platforms/mod-platforms/auto-curseforge.md) modpacks will expose the environment variables `MODPACK_NAME` and `MODPACK_VERSION`. The originally declared version, such as "LATEST" or "SNAPSHOT", is available in the variable `DECLARED_VERSION` 
 
 !!! example
 

scripts/start-configuration

@@ -113,7 +113,8 @@ fi
 
 cd /data || exit 1
 
-export ORIGINAL_TYPE=${TYPE^^}
+export DECLARED_TYPE=${TYPE^^}
+export DECLARED_VERSION="$VERSION"
 
 if isTrue "${ENABLE_AUTOPAUSE}"; then
   "${SCRIPTS:-/}start-autopause"

scripts/start-setupServerProperties

@@ -145,10 +145,10 @@ if ! isTrue "${SKIP_SERVER_PROPERTIES}"; then
     # which shows up in the server listing in the client
     if ! [ -v MOTD ]; then
       # snapshot is the odd case where we have to look at version to identify that label
-      if [[ ${ORIGINAL_TYPE} == "VANILLA" && ${VERSION} == "SNAPSHOT" ]]; then
+      if [[ ${DECLARED_TYPE} == "VANILLA" && ${VERSION} == "SNAPSHOT" ]]; then
         label=SNAPSHOT
       else
-        label=${ORIGINAL_TYPE}
+        label=${DECLARED_TYPE}
       fi
 
       # Convert label to title-case