Add skip-go-installation to use pre-installed Go

Add the golangci-lint to PATH

README.md

@@ -47,6 +47,9 @@ jobs:
 
           # Optional: show only new issues if it's a pull request. The default value is `false`.
           # only-new-issues: true
+
+          # Optional: if set to true then the action will use pre-installed Go
+          # skip-go-installation: true
 ```
 
 We recommend running this action in a job separate from other jobs (`go test`, etc)
@@ -94,7 +97,7 @@ jobs:
 You will also likely need to add the following `.gitattributes` file to ensure that line endings for windows builds are properly formatted:
 
 ```.gitattributes
-*.go text eol=lf 
+*.go text eol=lf
 ```
 
 ## Comments and Annotations

action.yml

@@ -1,4 +1,3 @@
----
 name: "Run golangci-lint"
 description: "Official golangci-lint action with line-attached annotations for found issues, caching and parallel execution."
 author: "golangci"
@@ -21,7 +20,10 @@ inputs:
     description: "if set to true and the action runs on a pull request - the action outputs only newly found issues"
     default: false
     required: true
-
+  skip-go-installation:
+    description: "if set to true then the action uses pre-install Go"
+    default: false
+    required: true
 runs:
   using: "node12"
   main: "dist/run/index.js"

src/install.ts

@@ -56,6 +56,12 @@ export async function installLint(versionConfig: VersionConfig): Promise<string>
 }
 
 export async function installGo(): Promise<void> {
+  const skipGoInstallation = core.getInput(`skip-go-installation`, { required: true }).trim()
+  if (skipGoInstallation.toLowerCase() == "true") {
+    core.info(`Skipping the installation of Go`)
+    return
+  }
+
   const startedAt = Date.now()
   process.env[`INPUT_GO-VERSION`] = `1`
   await setupGo()

src/run.ts

@@ -187,6 +187,7 @@ async function runLint(lintPath: string, patchPath: string): Promise<void> {
 export async function run(): Promise<void> {
   try {
     const { lintPath, patchPath } = await core.group(`prepare environment`, prepareEnv)
+    core.addPath(path.dirname(lintPath))
     await core.group(`run golangci-lint`, () => runLint(lintPath, patchPath))
   } catch (error) {
     core.error(`Failed to run: ${error}, ${error.stack}`)