add: GHA settings

Author: 54m

.github/.golangci.yml

@@ -0,0 +1,50 @@
+linters-settings:
+  dupl:
+    threshold: 100
+  goconst:
+    min-len: 2
+    min-occurrences: 2
+  goimports:
+    local-prefixes: github.com/golangci/golangci-lint
+  golint:
+    min-confidence: 0.3
+  govet:
+    check-shadowing: true
+  lll:
+    line-length: 120
+  misspell:
+    locale: US
+    ignore-words: []
+
+linters:
+  disable-all: true
+  enable:
+    - bodyclose
+    - deadcode
+    - dupl
+    - errcheck
+    - goconst
+    - gofmt
+    - goimports
+    - golint
+    - govet
+    - ineffassign
+    - misspell
+    - scopelint
+    - structcheck
+    - unconvert
+    - unused
+    - varcheck
+    - whitespace
+
+issues:
+  exclude-rules:
+    - path: _test\.go
+      linters:
+        - gomnd
+        - dupl
+
+service:
+  golangci-lint-version: 1.23.x
+  prepare:
+    - echo "here I can run custom commands, but no preparation needed for this repository"

.github/PULL_REQUEST_TEMPLATE.md

@@ -0,0 +1,6 @@
+<!-- This is a template. Please rewrite to the necessary contents when creating the PR. -->
+<!-- If there is an issue, enter it. -->
+Closes #XXX
+
+<!-- ## Overview -->
+<!-- Please write the purpose of this PR and the outline of implementation. -->

.github/workflows/go.yml

@@ -0,0 +1,26 @@
+name: Go
+
+on:
+  pull_request:
+  push:
+    branches:
+      - main
+
+jobs:
+  test:
+    runs-on: ubuntu-latest
+    env:
+      GO111MODULE: on
+
+    steps:
+      - name: Set up Go 1.12
+        uses: actions/setup-go@v1
+        with:
+          go-version: 1.12
+        id: go
+
+      - uses: actions/checkout@v2
+
+      - name: Run tests
+        run: |
+          make test

.github/workflows/reviewdog.yml

@@ -0,0 +1,21 @@
+name: linter
+
+on:
+  pull_request:
+  push:
+    branches:
+      - main
+
+jobs:
+  golangci-lint:
+    name: runner / golangci-lint
+    runs-on: ubuntu-latest
+    steps:
+      - name: Check out code into the Go module directory
+        uses: actions/checkout@v2
+
+      - name: golangci-lint
+        uses: golangci/golangci-lint-action@v2
+        with:
+          args: "--config=.github/.golangci.yml"
+          skip-go-installation: true