Replace CircleCI with Github actions

Signed-off-by: Evgenii Stratonikov <evgeniy@nspcc.ru>

.circleci/config.yml

@@ -1,12 +0,0 @@
-# Golang CircleCI 2.0 configuration file
-#
-# Check https://circleci.com/docs/2.0/language-go/ for more details
-version: 2
-jobs:
-  build:
-    docker:
-      - image: circleci/golang:1.11
-    working_directory: ~/{{ORG_NAME}}/{{REPO_NAME}}
-    steps:
-      - checkout
-      - run: go test -v ./...

.github/workflows/run_tests.yml

@@ -0,0 +1,92 @@
+name: Tests
+
+on:
+  pull_request:
+    branches:
+      - master
+    types: [ opened, synchronize ]
+  workflow_dispatch:
+
+jobs:
+  lint:
+    name: Lint
+    runs-on: ubuntu-latest
+
+    steps:
+      - uses: actions/checkout@v2
+      - name: golangci-lint
+        uses: golangci/golangci-lint-action@v2
+        with:
+          version: latest
+
+  test_cover:
+    name: Coverage
+    runs-on: ubuntu-20.04
+
+    env:
+      CGO_ENABLED: 0
+    steps:
+      - uses: actions/checkout@v2
+        with:
+          fetch-depth: 0
+
+      - name: Set up Go
+        uses: actions/setup-go@v2
+        with:
+          go-version: 1.17
+
+      - name: Restore Go modules from cache
+        uses: actions/cache@v2
+        with:
+          path: /home/runner/go/pkg/mod
+          key: deps-${{ hashFiles('go.sum') }}
+
+      - name: Update Go modules
+        run: go mod download -json
+
+      - name: Write coverage profile
+        run: go test -v ./... -coverprofile=./coverage.txt -covermode=atomic -coverpkg=./pkg...,./cli/...
+
+      - name: Upload coverage results to Codecov
+        uses: codecov/codecov-action@v1
+        with:
+          fail_ci_if_error: false
+          path_to_write_report: ./coverage.txt
+          verbose: true
+
+  tests:
+    name: Run tests
+    runs-on: ${{ matrix.os }}
+    strategy:
+      matrix:
+        os: [ ubuntu-20.04, windows-2022 ]
+        go_versions: [ '1.15', '1.16', '1.17' ]
+        exclude:
+          - os: windows-2022
+            go_versions: '1.15'
+          - os: windows-2022
+            go_versions: '1.16'
+          - os: ubuntu-20.04
+            go_versions: '1.17'
+      fail-fast: false
+    steps:
+      - uses: actions/checkout@v2
+        with:
+          fetch-depth: 0
+
+      - name: Set up Go
+        uses: actions/setup-go@v2
+        with:
+          go-version: '${{ matrix.go_versions }}'
+
+      - name: Restore Go modules from cache
+        uses: actions/cache@v2
+        with:
+          path: /home/runner/go/pkg/mod
+          key: deps-${{ hashFiles('go.sum') }}
+
+      - name: Update Go modules
+        run: go mod download -json
+
+      - name: Run tests
+        run: go test -v ./...