drop CircleCI support

It stopped running our tests/builds, but we don't care, Github works well.

.circleci/config.yml

@@ -1,138 +0,0 @@
-version: 2.1
-
-executors:
-  go1_17:
-    docker:
-      - image: cimg/go:1.17
-  go1_18:
-    docker:
-      - image: cimg/go:1.18
-  go1_19:
-    docker:
-      - image: cimg/go:1.19
-
-commands:
-  gomod:
-    steps:
-      - restore_cache:
-          keys: [deps-v2-]
-      - run:
-          name: Download go module dependencies
-          command: go mod download
-      - save_cache:
-          key: deps-v2-{{ checksum "go.sum" }}-{{ checksum "go.sum" }}
-          paths: [/home/circleci/go/pkg/mod]
-
-jobs:
-  lint:
-    working_directory: /home/circleci/go/src/github.com/nspcc-dev/neo-go
-    # TODO: temp workaround, need to upgrade to go1_18 after https://github.com/golangci/golangci-lint/issues/2649 is resolved.
-    executor: go1_17
-    steps:
-      - checkout
-      - gomod
-      - run:
-          name: go-lint
-          command: |
-            curl -sSfL https://raw.githubusercontent.com/golangci/golangci-lint/master/install.sh | sh -s -- -b $(go env GOPATH)/bin v1.49.0
-            make lint
-
-  test_1_17:
-    working_directory: /home/circleci/go/src/github.com/nspcc-dev/neo-go
-    executor: go1_17
-    steps:
-      - checkout
-      - run: git submodule sync
-      - run: git submodule update --init
-      - gomod
-      - run:
-          command: go test -v -race ./...
-          no_output_timeout: 15m
-
-  test_1_18:
-    working_directory: /home/circleci/go/src/github.com/nspcc-dev/neo-go
-    executor: go1_18
-    steps:
-      - checkout
-      - run: git submodule sync
-      - run: git submodule update --init
-      - gomod
-      - run:
-          command: go test -v -race ./...
-          no_output_timeout: 15m
-
-  test_1_19:
-    working_directory: /home/circleci/go/src/github.com/nspcc-dev/neo-go
-    executor: go1_19
-    steps:
-      - checkout
-      - run: git submodule sync
-      - run: git submodule update --init
-      - gomod
-      - run:
-          command: go test -v -race ./...
-          no_output_timeout: 15m
-
-  build_cli:
-    working_directory: /home/circleci/go/src/github.com/nspcc-dev/neo-go
-    executor: go1_19
-    steps:
-      - checkout
-      - gomod
-      - run: make build
-      - store_artifacts:
-          path: bin
-          destination: /
-
-  build_image:
-    working_directory: /home/circleci/go/src/github.com/nspcc-dev/neo-go
-    executor: go1_19
-    docker:
-      - image: golang:1-alpine
-    steps:
-      - run: apk update && apk add git make curl tar
-      - checkout
-      - gomod
-      - setup_remote_docker:
-          version: 20.10.6
-      - run:
-          name: Install Docker client
-          command: |
-            set -x
-            VER="20.10.6"
-            curl -L -o /tmp/docker-$VER.tgz https://download.docker.com/linux/static/stable/x86_64/docker-$VER.tgz
-            tar -xz -C /tmp -f /tmp/docker-$VER.tgz
-            mv /tmp/docker/* /usr/bin
-      - run: make image
-
-
-workflows:
-  version: 2
-  workflow:
-    jobs:
-      - lint:
-          filters:
-            tags:
-              only: v/[0-9]+\.[0-9]+\.[0-9]+/
-      - test_1_17:
-          filters:
-            tags:
-              only: v/[0-9]+\.[0-9]+\.[0-9]+/
-      - test_1_18:
-          filters:
-            tags:
-              only: v/[0-9]+\.[0-9]+\.[0-9]+/
-      - test_1_19:
-          filters:
-            tags:
-              only: v/[0-9]+\.[0-9]+\.[0-9]+/
-      - build_cli:
-          filters:
-            tags:
-              only: v/[0-9]+\.[0-9]+\.[0-9]+/
-      - build_image:
-          requires:
-            - build_cli
-          filters:
-            tags:
-              only: v/[0-9]+\.[0-9]+\.[0-9]+/

README.md

@@ -12,7 +12,6 @@
 <hr />
 
 [![codecov](https://codecov.io/gh/nspcc-dev/neo-go/branch/master/graph/badge.svg)](https://codecov.io/gh/nspcc-dev/neo-go)
-[![CircleCI](https://circleci.com/gh/nspcc-dev/neo-go/tree/master.svg?style=shield)](https://circleci.com/gh/nspcc-dev/neo-go/tree/master)
 [![GithubWorkflows Tests](https://github.com/nspcc-dev/neo-go/actions/workflows/run_tests.yml/badge.svg)](https://github.com/nspcc-dev/neo-go/actions/workflows/run_tests.yml)
 [![Report](https://goreportcard.com/badge/github.com/nspcc-dev/neo-go)](https://goreportcard.com/report/github.com/nspcc-dev/neo-go)
 [![GoDoc](https://godoc.org/github.com/nspcc-dev/neo-go?status.svg)](https://godoc.org/github.com/nspcc-dev/neo-go)