Added support for downloading mods from Modrinth (#1577)

tests/setuponlytests/modrinth/docker-compose.yml

@@ -0,0 +1,15 @@
+version: "3"
+
+services:
+  mc:
+    image: ${IMAGE_TO_TEST:-itzg/minecraft-server}
+    environment:
+      EULA: "true"
+      SETUP_ONLY: "true"
+      TYPE: FABRIC
+      FABRIC_LAUNCHER: /servers/fake.jar
+      CUSTOM_SERVER: /servers/fake.jar
+      MODRINTH_PROJECTS: fabric-api,cloth-config
+    volumes:
+      - ./data:/data
+      - ./fake.jar:/servers/fake.jar

tests/setuponlytests/modrinth/verify.sh

@@ -0,0 +1 @@
+mc-image-helper assert fileExists "mods/cloth-config-*.jar" "mods/fabric-api-*.jar"