Enable linting with Actions

Author: mislav

.github/workflows/lint.yml

@@ -0,0 +1,39 @@
+name: Lint
+on:
+  push:
+    paths:
+      - "**.go"
+      - go.mod
+      - go.sum
+  pull_request:
+    paths:
+      - "**.go"
+      - go.mod
+      - go.sum
+
+jobs:
+  lint:
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Set up Go 1.15
+        uses: actions/setup-go@v2
+        with:
+          go-version: 1.15
+
+      - name: Check out code
+        uses: actions/checkout@v2
+
+      - name: Verify dependencies
+        env:
+          LINT_VERSION: 1.33.0
+        run: |
+          go mod verify
+          go mod download
+
+          curl -fsSL https://github.com/golangci/golangci-lint/releases/download/v${LINT_VERSION}/golangci-lint-${LINT_VERSION}-linux-amd64.tar.gz | \
+            tar xz --strip-components 1 --wildcards \*/golangci-lint
+          mkdir -p bin && mv golangci-lint bin/
+
+      - name: Run checks
+        run: bin/golangci-lint run --out-format=github-actions

.golangci.yml

@@ -0,0 +1,15 @@
+linters:
+  enable:
+    - gofmt
+    - godot
+    - golint
+
+linters-settings:
+  godot:
+    # comments to be checked: `declarations`, `toplevel`, or `all`
+    scope: declarations
+    # check that each sentence starts with a capital letter
+    capital: true
+
+issues:
+  exclude-use-default: false