create custom docker image for fargo actions

.github/workflows/test.yml

@@ -10,11 +10,8 @@ jobs:
     name: Run Tests
     runs-on: docker
     container:
-      image: ghcr.io/gleam-lang/gleam:v1.15.2-erlang
+      image: 853019563312.dkr.ecr.eu-central-1.amazonaws.com/gleam-tester-homelabstack:latest
     steps:
-      - name: Install Node.js
-        run: apt-get update && apt-get install -y nodejs npm
-
       - name: Checkout code
         uses: actions/checkout@v4