Ensure Modrinth support specifies paper/purpur loader as needed (#1990)

Dockerfile

@@ -46,7 +46,7 @@ RUN easy-add --var os=${TARGETOS} --var arch=${TARGETARCH}${TARGETVARIANT} \
   --var version=0.1.1 --var app=maven-metadata-release --file {{.app}} \
   --from https://github.com/itzg/{{.app}}/releases/download/{{.version}}/{{.app}}_{{.version}}_{{.os}}_{{.arch}}.tar.gz
 
-ARG MC_HELPER_VERSION=1.25.6
+ARG MC_HELPER_VERSION=1.25.9
 ARG MC_HELPER_BASE_URL=https://github.com/itzg/mc-image-helper/releases/download/${MC_HELPER_VERSION}
 RUN curl -fsSL ${MC_HELPER_BASE_URL}/mc-image-helper-${MC_HELPER_VERSION}.tgz \
   | tar -C /usr/share -zxf - \

scripts/start-setupModpack

@@ -183,7 +183,7 @@ esac
 fi
 }
 
-function genericPacks() {
+function handleGenericPacks() {
   : "${GENERIC_PACKS:=${GENERIC_PACK}}"
   : "${GENERIC_PACKS_PREFIX:=}"
   : "${GENERIC_PACKS_SUFFIX:=}"
@@ -267,7 +267,7 @@ function genericPacks() {
   fi
 }
 
-function modrinthProjects() {
+function handleModrinthProjects() {
   : "${MODRINTH_PROJECTS:=}"
   : "${MODRINTH_DOWNLOAD_OPTIONAL_DEPENDENCIES:=true}"
   : "${MODRINTH_ALLOWED_VERSION_TYPE:=release}"
@@ -275,8 +275,11 @@ function modrinthProjects() {
   if [[ $MODRINTH_PROJECTS ]] && isFamily HYBRID FORGE FABRIC SPIGOT; then
     if isFamily HYBRID FORGE; then
       loader=forge
+    elif isFaily FABRIC; then
+      loader=fabric
     else
-      loader="${FAMILY,,}"
+      # we're left with Bukkit/Spigot down-lines where plugins seem to be
+      loader="${TYPE,,}"
     fi
     mc-image-helper modrinth \
       --output-directory=/data \
@@ -294,8 +297,8 @@ handleModpackListOrFile
 
 handleCurseForgeManifest
 
-genericPacks
+handleGenericPacks
 
-modrinthProjects
+handleModrinthProjects
 
 exec "${SCRIPTS:-/}start-setupModconfig" "$@"