added some tests and fixed server secret to be persistent

.gitea/workflows/ci.yaml

@@ -1,47 +1,30 @@
 name: CI
+
 on:
   push:
-    branches: [main, dev]
+    branches: [dev]
   pull_request:
     branches: [main]
 
 jobs:
-  test:
+  backend-tests:
     runs-on: ubuntu-latest
-
-    services:
-      postgres:
-        image: postgres:16-alpine
-        env:
-          POSTGRES_DB: etfo-db
-          POSTGRES_USER: test
-          POSTGRES_PASSWORD: test
-        ports:
-          - 5432:5432
-        options: >-
-          --health-cmd pg_isready
-          --health-interval 10s
-          --health-timeout 5s
-          --health-retries 5
-
+    defaults:
+      run:
+        working-directory: backend
     steps:
-      - name: Checkout
-        uses: actions/checkout@v3
+      - uses: actions/checkout@v4
 
-      - name: Set up Java 21
-        uses: actions/setup-java@v3
+      - uses: actions/setup-java@v4
         with:
           java-version: '21'
           distribution: 'temurin'
+          cache: gradle
 
       - name: Make Gradle wrapper executable
         run: chmod +x ./gradlew
-        working-directory: backend
 
       - name: Run tests
         run: ./gradlew test --no-daemon
-        working-directory: backend
-        env:
-          SPRING_DATASOURCE_URL: jdbc:postgresql://localhost:5432/etfo-db
-          SPRING_DATASOURCE_USERNAME: test
-          SPRING_DATASOURCE_PASSWORD: test
+
+  # TODO: CD logic — deploy after successful tests on merge to main