Quickly update CI to incorporate postgres DB

.gitlab-ci.yml

@@ -1,23 +1,49 @@
-image: "registry.nickbland.dev/nickbland/rust-docker-ci:latest"
-
 default:
   before_script:
     - rustc --version && cargo --version
+  image: "registry.nickbland.dev/nickbland/rust-docker-ci:latest"
+  cache:
+    key:
+      files:
+        - Cargo.lock
+    paths:
+      - .cargo/
+      - target/
+    policy: pull-push
+
+variables:
+  FF_USE_FASTZIP: "true"
+  CACHE_COMPRESSION_LEVEL: "fastest"
 
 stages:
+  - format
   - test
 
+format-code:
+  stage: format
+  script:
+    - cargo fmt -- --check
+
+postgres-service:
+  stage: test
+  services:
+    - postgres:15-alpine
+  variables:
+    POSTGRES_USER: postgres
+    POSTGRES_PASSWORD: password
+    POSTGRES_DB: newsletter
+    POSTGRES_HOST: postgres
+  script:
+    - SKIP_DOCKER=true ./scripts/init_db.sh # Migrate DB
+
 test-code:
   stage: test
+  needs: ["postgres-service"]
   script:
-    - cargo test --verbose
+    - export DATABASE_URL="postgres://postgres:password@postgres:5432/newsletter" cargo test
 
 lint-code:
   stage: test
+  needs: ["postgres-service"]
   script:
-    - cargo clippy -- -D warnings
-    
-format-code:
-  stage: test
-  script:
-    - cargo fmt -- --check
+    - DATABASE_URL="postgres://postgres:password@postgres:5432/newsletter" cargo clippy -- -D warnings