Get rid of the custom docker image

.github/workflows/run-ci.yaml

@@ -29,13 +29,10 @@ jobs:
         uses: actions/checkout@v3
         with:
           repository: sinch/sinch-sdk-mockserver
+          ref: Remove-custom-docker-image
           token: ${{ secrets.PAT_CI }}
           fetch-depth: 0
           path: sinch-sdk-mockserver
-      - name: Build custom Docker image
-        run: |
-          cd sinch-sdk-mockserver
-          docker build -t sinch-sdk-mockserver -f Dockerfile .
       - name: Install Docker Compose
         run: |
           sudo apt-get update
@@ -44,11 +41,6 @@ jobs:
         run: |
           cd sinch-sdk-mockserver
           docker-compose up -d
-      - name: Wait for the mock servers to be healthy
-        run: |
-          cd sinch-sdk-mockserver
-          chmod +x ./scripts/healthcheck.sh
-          ./scripts/healthcheck.sh
       - name: Create target directories for feature files
         run: |
           mkdir -p ./packages/fax/tests/e2e/features