Create reviewdog.yml

.github/workflows/reviewdog.yml

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+name: reviewdog
+on: [pull_request]
+jobs:
+  reviewdog:
+    name: reviewdog
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+      - uses: actions/setup-go@v2
+        with:
+          go-version: '1.15'
+      - name: install tools
+        run: |
+          go get -u golang.org/x/lint/golint
+      - uses: reviewdog/action-setup@v1
+      - name: Run reviewdog
+        env:
+          REVIEWDOG_GITHUB_API_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+        run: |
+          reviewdog -reporter=github-pr-review \
+                    -runners=golint,govet,gofmt \
+                    -fail-on-error
+      # reviewdog doesn't work with go vet, so run again
+      - run: go vet ./...

.reviewdog.yml

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+runner:
+  golint:
+    cmd: golint ./...
+    errorformat:
+      - "%f:%l:%c: %m"
+    level: warning
+  govet:
+    cmd: go vet ./...
+    format: govet
+  gofmt:
+    cmd: test -z $(gofmt -l  .) || (gofmt -s -d  . && exit 1)
+    format: diff