ci: add test workflow

.github/workflows/test.yml

@@ -0,0 +1,31 @@
+---
+name: Tests
+
+on: [push, pull_request, workflow_dispatch]
+
+jobs:
+  tests:
+    if: (github.event_name == 'push') ||
+      (github.event_name == 'pull_request' &&
+      github.event.pull_request.head.repo.full_name != github.repository) ||
+      (github.event_name == 'workflow_dispatch')
+
+    runs-on: ubuntu-20.04
+
+    steps:
+      - uses: actions/checkout@master
+
+      - name: Setup Go
+        uses: actions/setup-go@v2
+        with:
+          go-version: '1.19'
+
+      - name: Go linter
+        uses: golangci/golangci-lint-action@v3
+        with:
+          args: --config=golangci-lint.yml --out-${NO_FUTURE}format colored-line-number
+          skip-cache: true
+
+      - name: Unit tests
+        run: |
+            go test -race ./...

golangci-lint.yml

@@ -0,0 +1,30 @@
+run:
+  timeout: 3m
+
+linters:
+  disable-all: true
+  enable:
+    - lll
+    - govet
+    - gofmt
+    - stylecheck
+    - godot
+
+linters-settings:
+  lll:
+    line-length: 100
+    tab-width: 4
+  gofmt:
+    simplify: false
+  stylecheck:
+    # Temporary disable "Poorly chosen identifier" check.
+    checks: ["all", "-ST1003"]
+  godot:
+    scope: toplevel
+    period: true
+
+issues:
+  exclude-rules:
+    - linters:
+        - lll
+      source: "\t?// (see )?https://"