Adding MODS_FORGEAPI to auto-download by project ids (#1275)

Co-authored-by: christopher blodgett <christopher.blodgett@gmail.com>
Co-authored-by: Geoff Bourne <itzgeoff@gmail.com>

tests/setuponlytests/forgeapimods_file/docker-compose.yml

@@ -0,0 +1,17 @@
+version: "3"
+
+services:
+  mc:
+    restart: "no"
+    image: ${IMAGE_TO_TEST:-itzg/minecraft-server}
+    environment:
+      EULA: "TRUE"
+      SETUP_ONLY: "TRUE"
+      VERSION: ${MINECRAFT_VERSION:-LATEST}
+      MODS_FORGEAPI_FILE: /config/example.json
+      # Key is defined in .github/workflows/pr.yml and ci.yml
+      # This should be coming from github secrets.
+      MODS_FORGEAPI_KEY: ${MODS_FORGEAPI_KEY}
+      REMOVE_OLD_FORGEAPI_MODS: "TRUE"
+    volumes:
+      - ./example.json:/config/example.json:ro