WIP: Attempt at building and caching the Docker image

.github/workflows/continuous-integration.yml

@@ -8,6 +8,28 @@ on:
       - develop
 
 jobs:
+  build-and-cache:
+    name: Build and cache image
+    runs-on: ubuntu-latest
+    steps:
+        -
+      name: Checkout
+      uses: actions/checkout@v4
+        -
+      name: Set up Docker Buildx
+      uses: docker/setup-buildx-action@v3
+        -
+      name: Build and cache image
+      uses: docker/build-push-action@v6
+      with:
+        context: .
+        file: ./Dockerfile
+        build-args: RAILS_ENV=test
+        push: false
+        tags: app_test:latest
+        cache-from: type=gha
+        cache-to: type=gha,mode=min
+
   test:
     runs-on: ubuntu-latest