Support only-new-issues (#19)

Fixes #16

Author: jirfag

.github/workflows/test.yml

@@ -15,13 +15,12 @@ jobs:
         npm install
         npm run prepare-deps
         npm run all
-        git diff --exit-code
   test: # make sure the action works on a clean machine without building
     runs-on: ubuntu-latest
     steps:
     - uses: actions/checkout@v1
     - uses: ./
       with:
         version: v1.26
-        args: --issues-exit-code=0 ./...
-        working-directory: sample
+        args: --issues-exit-code=0 ./sample/...
+        only-new-issues: true

README.md

@@ -37,6 +37,9 @@ jobs:
 
           # Optional: golangci-lint command line arguments.
           # args: --issues-exit-code=0
+
+          # Optional: show only new issues if it's a pull request. The default value is `false`.
+          # only-new-issues: true
 ```
 
 We recommend running this action in a job separate from other jobs (`go test`, etc)

action.yml

@@ -13,6 +13,14 @@ inputs:
   working-directory:
     description: 'golangci-lint working directory, default is project root'
     required: false
+  github-token:
+    description: 'the token is used for fetching patch of a pull request to show only new issues'
+    default: ${{ github.token }}
+    required: true
+  only-new-issues:
+    description: 'if set to true and the action runs on a pull request - the action outputs only newly found issues'
+    default: false
+    required: true
 
 runs:
   using: 'node12'