Use golangci-lint GitHub action.

- Rather than manually downloading and invoking golangci-lint, use the GitHub
action provided by the developers.
- Configure golangci with a config file rather than passing command line args.
This enables the same config to be used locally and on CI without introducing
duplication. It also allows much more flexibililty in configuration than using
CLI args alone.

.github/workflows/go.yml

@@ -14,10 +14,12 @@ jobs:
           go-version: ${{ matrix.go }}
       - name: Check out source
         uses: actions/checkout@v2
-      - name: Install Linters
-        run: "curl -sfL https://install.goreleaser.com/github.com/golangci/golangci-lint.sh | sh -s -- -b $(go env GOPATH)/bin v1.43.0"
       - name: Build
         run: go build ./...
       - name: Test
-        run: |
-          ./run_tests.sh
+        run: env GORACE="halt_on_error=1" go test -race ./...
+      - name: Lint
+        uses: golangci/golangci-lint-action@v2
+        with:
+          version: v1.44
+

.golangci.yml

@@ -0,0 +1,20 @@
+run:
+  deadline: 10m
+
+linters:
+  disable-all: true
+  enable:
+    - asciicheck
+    - deadcode
+    - errcheck
+    - gofmt
+    - goimports
+    - gosimple
+    - govet
+    - ineffassign
+    - misspell
+    - revive
+    - structcheck
+    - unconvert
+    - unparam
+    - unused

run_tests.sh

@@ -14,28 +14,5 @@ go version
 # run tests
 env GORACE="halt_on_error=1" go test -race ./...
 
-# set output format for linter
-if [[ -v CI ]]; then
-    OUT_FORMAT="github-actions"
-else
-    OUT_FORMAT="colored-line-number"
-fi
-
 # run linter
-golangci-lint run --disable-all --deadline=10m \
-  --out-format=$OUT_FORMAT \
-  --enable=gofmt \
-  --enable=revive \
-  --enable=govet \
-  --enable=gosimple \
-  --enable=unconvert \
-  --enable=ineffassign \
-  --enable=structcheck \
-  --enable=goimports \
-  --enable=misspell \
-  --enable=unparam \
-  --enable=deadcode \
-  --enable=unused \
-  --enable=errcheck \
-  --enable=asciicheck
-  
+golangci-lint run