feat: add testing setup in backend

tests/Dockerfile

@@ -0,0 +1,9 @@
+FROM cypress/included:13.5.1
+
+WORKDIR /e2e
+COPY package.json yarn.lock ./
+COPY tests/package.json ./tests/package.json
+RUN yarn install --frozen-lockfile
+
+COPY tests ./tests
+WORKDIR /e2e/tests