add unit & integration tests to CI & split off build step

.github/workflows/staging-deploy.yml

@@ -4,13 +4,14 @@ on:
   push:
     branches:
       - main
+      - INTRN-243-setup-ci-pipeline
 
 concurrency:
   group: ${{ github.workflow }}-${{ github.ref }}
   cancel-in-progress: true
 
 jobs:
-  staging-deploy:
+  build:
     runs-on: ubuntu-latest
 
     steps:
@@ -35,10 +36,108 @@ jobs:
         uses: docker/build-push-action@v4
         with:
           context: .
-          push: true
           tags: registry.digitalocean.com/akatsuki/interns-backend:latest
-          cache-from: type=gha
-          cache-to: type=gha,mode=max
+          # cache-from: type=gha
+          # cache-to: type=gha,mode=max
+          outputs: type=docker,dest=/tmp/interns-backend.tar
+
+      - name: Upload build artifact
+        uses: actions/upload-artifact@v2
+        with:
+          name: interns-backend
+          path: /tmp/interns-backend.tar
+
+  unit-tests:
+    runs-on: ubuntu-latest
+    needs: build
+
+    steps:
+      - name: Check out latest commit
+        uses: actions/checkout@v3
+
+      - name: Set up QEMU
+        uses: docker/setup-qemu-action@v2
+
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v2
+
+      - name: Download built image artifact
+        uses: actions/download-artifact@v3
+        with:
+          name: interns-backend
+          path: /tmp/
+
+      - name: Load image
+        run: |
+          docker load --input /tmp/interns-backend.tar
+          # docker image ls -a
+
+      - name: Run containers
+        run: docker-compose up -d interns-backend
+
+      - name: Run tests
+        run: docker-compose exec -T users-service /scripts/run-tests.sh
+
+      - name: Stop containers
+        if: always()
+        run: docker-compose down
+
+  integration-tests:
+    runs-on: ubuntu-latest
+    needs: build
+
+    steps:
+      - name: Check out latest commit
+        uses: actions/checkout@v3
+
+      - name: Set up QEMU
+        uses: docker/setup-qemu-action@v2
+
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v2
+
+      - name: Download built image artifact
+        uses: actions/download-artifact@v3
+        with:
+          name: interns-backend
+          path: /tmp/
+
+      - name: Load image
+        run: |
+          docker load --input /tmp/interns-backend.tar
+          # docker image ls -a
+
+      - name: Run containers
+        run: docker-compose up -d interns-backend postgres redis
+
+      - name: Run tests
+        run: docker-compose exec -T users-service /scripts/run-tests.sh
+
+      - name: Stop containers
+        if: always()
+        run: docker-compose down
+
+  staging-deploy:
+    runs-on: ubuntu-latest
+    needs: [build, unit-tests, integration-tests]
+
+    steps:
+      - name: Set up QEMU
+        uses: docker/setup-qemu-action@v2
+
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v2
+
+      - name: Download built image artifact
+        uses: actions/download-artifact@v3
+        with:
+          name: interns-backend
+          path: /tmp/
+
+      - name: Load image
+        run: |
+          docker load --input /tmp/interns-backend.tar
+          # docker image ls -a
 
       - name: Save kubeconfig from digitalocean
         run: doctl k8s cluster kubeconfig save --expiry-seconds 600 akatsuki-staging