Revert "chore: delete .circleci folder (#699)" (#705)

This reverts commit 2eea63b since CircleCI is still used here.

.circleci/config.yml

@@ -0,0 +1,39 @@
+version: 2.1
+
+orbs:
+  changelog: ory/changelog@0.1.4
+  nancy: ory/nancy@0.0.13
+  golangci: ory/golangci@0.0.19
+
+jobs:
+  test:
+    docker:
+      - image: cimg/go:1.18
+    steps:
+      - checkout
+      - setup_remote_docker
+      - restore_cache:
+          keys:
+            - go-github-ory-fosite-v2-{{ checksum "go.sum" }}
+      - run: go mod download
+      - save_cache:
+          key: go-github-ory-fosite-v2-{{ checksum "go.sum" }}
+          paths:
+            - "/go/pkg/mod"
+      - run: go install github.com/mattn/goveralls github.com/ory/go-acc
+      - run: go-acc -o coverage.txt ./... -- -v -failfast -timeout=20m
+
+workflows:
+  tbr:
+    jobs:
+      - nancy/test
+      - test
+      - golangci/lint
+      - changelog/generate:
+          requires:
+            - test
+          filters:
+            tags:
+              only: /.*/
+            branches:
+              only: master