ci: Add golangci-lint.

.github/workflows/build.yml

@@ -16,6 +16,9 @@ jobs:
         uses: actions/checkout@v2
         with:
           fetch-depth: 0
+      - name: "Install golangci-lint"
+        run: |
+          curl -sfL https://raw.githubusercontent.com/golangci/golangci-lint/master/install.sh | sh -s -- -b $HOME/bin latest
       - name: Set up Go
         uses: actions/setup-go@v2
         with:
@@ -29,6 +32,10 @@ jobs:
             ${{ runner.os }}-go-
       - name: Dependencies
         run: go mod tidy
+      - name: "Run golangci-lint"
+        run: |
+          export PATH=$HOME/bin:$PATH
+          golangci-lint run
       - name: Test
         run: go test -v -failfast -race -coverpkg=./... -covermode=atomic -coverprofile=coverage.txt ./...
       - name: Upload coverage

.golangci.yml

@@ -0,0 +1,43 @@
+linters:
+  enable-all: true
+  disable:
+    - godox
+    - wsl
+    - gomnd
+    - testpackage
+    - nolintlint
+    - gofumpt
+    - nlreturn
+    - gci
+linters-settings:
+  maligned:
+    # print struct with more effective memory layout or not, false by default
+    suggest-new: true
+  gocyclo:
+    # minimal code complexity to report, 30 by default (but we recommend 10-20)
+    min-complexity: 30
+  goimports:
+    # put imports beginning with prefix after 3rd-party packages;
+    # it's a comma-separated list of prefixes
+    local-prefixes: github.com/goreleaser/fileglob
+  govet:
+    check-shadowing: true
+  errcheck:
+    ignore: ^Close.*,fmt:.*,github.com/pkg/errors:^Wrap.*,os:^Setenv$
+  lll:
+    line-length: 200
+  golint:
+    min-confidence: .8
+  nakedret:
+    max-func-lines: 0
+  gocritic:
+    disabled-checks:
+      - whyNoLint
+    enabled-tags:
+      - style
+      - performance
+issues:
+  exclude-rules:
+    - text: "G104" # gosec G104 is caught by errcheck
+      linters:
+        - gosec