create custom docker image for fargo actions

.github/test_image/Dockerfile

@@ -0,0 +1,3 @@
+FROM ghcr.io/gleam-lang/gleam:v1.15.2-erlang
+
+RUN apt-get update && apt-get install -y nodejs npm && rm -rf /var/lib/apt/lists/*

.github/test_image/build.sh

@@ -0,0 +1,16 @@
+#!/bin/sh
+
+set -e
+
+export AWS_PROFILE=personal
+export AWS_REGION=eu-central-1
+
+REPO_NAME="gleam-tester-homelabstack"
+
+if ! aws ecr describe-repositories --repository-names "$REPO_NAME" >/dev/null 2>&1; then
+  aws ecr create-repository --repository-name "$REPO_NAME"
+fi
+
+docker buildx build --platform linux/amd64,linux/arm64 -t "853019563312.dkr.ecr.eu-central-1.amazonaws.com/${REPO_NAME}:latest" --push .
+
+echo "Docker image built and pushed to AWS ECR"

.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