Merge pull request #292 from reviewdog/update-doc

Update document about GitHub Actions platform

README.md

@@ -257,19 +257,11 @@ Example: [.github/workflows/reviewdog.yml](.github/workflows/reviewdog.yml)
 ```yaml
 - name: Run reviewdog
   env:
-    CI_PULL_REQUEST: ${{ github.event.number }}
-    CI_COMMIT: ${{ github.event.pull_request.head.sha }}
-    CI_REPO_OWNER: ${{ github.event.repository.owner.login }}
-    CI_REPO_NAME: ${{ github.event.repository.name }}
-    CI_BRANCH: ${{ github.event.pull_request.head.ref }}
     REVIEWDOG_GITHUB_API_TOKEN: ${{ secrets.GITHUB_TOKEN }}
   run: |
     golint ./... | reviewdog -f=golint -reporter=github-pr-check
 ```
 
-You don't need to specify `CI_*` environment variables once
-[#279](https://github.com/reviewdog/reviewdog/issues/279) is fixed.
-
 Note that it reports result to GitHub Actions log consle for Pull
 Requests from fork repository because due to [GitHub Actions
 restriction](https://help.github.com/en/articles/virtual-environments-for-github-actions#github_token-secret),
@@ -369,6 +361,26 @@ $ reviewdog -reporter=gitlab-mr-commit
 
 ## Supported CI services
 
+### GitHub Actions
+
+Example: [.github/workflows/reviewdog.yml](.github/workflows/reviewdog.yml)
+
+```yaml
+name: reviewdog
+on: [pull_request]
+jobs:
+  reviewdog:
+    name: reviewdog
+    runs-on: ubuntu-latest
+    steps:
+      # ...
+      - name: Run reviewdog
+        env:
+          REVIEWDOG_GITHUB_API_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+        run: |
+          reviewdog -reporter=github-pr-check -runners=golint,govet
+```
+
 ### Travis CI
 
 #### Travis CI (-reporter=github-pr-check)

cmd/reviewdog/main.go

@@ -118,7 +118,7 @@ const (
 		$ export REVIEWDOG_INSECURE_SKIP_VERIFY=true
 
 	For non-local reporters, reviewdog automatically get necessary data from
-	environment variable in CI service (Travis CI, Circle CI, drone.io, GitLab CI).
+	environment variable in CI service (GitHub Actions, Travis CI, Circle CI, drone.io, GitLab CI).
 	You can set necessary data with following environment variable manually if
 	you want (e.g. run reviewdog in Jenkins).