Add go-version to action outputs

This provides the semver version of Go that has been installed. This is useful
if only a major or minor version has been provided as the input go-version
value.

action.yml

@@ -1,7 +1,7 @@
 name: 'Setup Go environment'
 description: 'Setup a Go environment and add it to the PATH'
 author: 'GitHub'
-inputs: 
+inputs:
   go-version:
     description: 'The Go version to download (if necessary) and use. Supports semver spec and ranges.'
   check-latest:
@@ -10,6 +10,9 @@ inputs:
   token:
     description: Used to pull node distributions from go-versions.  Since there's a default, this is typically not supplied by the user.
     default: ${{ github.token }}
+outputs:
+  go-version:
+    description: 'The installed Go version. Useful when given a version range as input.'
 runs:
   using: 'node16'
   main: 'dist/index.js'

dist/index.js

@@ -2100,6 +2100,12 @@ function run() {
             let goPath = yield io.which('go');
             let goVersion = (child_process_1.default.execSync(`${goPath} version`) || '').toString();
             core.info(goVersion);
+            // get the installed version as an Action output
+            // based on go/src/cmd/go/internal/version/version.go:
+            // fmt.Printf("go version %s %s/%s\n", runtime.Version(), runtime.GOOS, runtime.GOARCH)
+            // expecting go<version> for runtime.Version()
+            let goVersionOutput = [...goVersion.split(' ')[2]].slice(2).join('');
+            core.setOutput('go-version', goVersionOutput);
             core.startGroup('go env');
             let goEnv = (child_process_1.default.execSync(`${goPath} env`) || '').toString();
             core.info(goEnv);

src/main.ts

@@ -48,6 +48,13 @@ export async function run() {
     let goVersion = (cp.execSync(`${goPath} version`) || '').toString();
     core.info(goVersion);
 
+    // get the installed version as an Action output
+    // based on go/src/cmd/go/internal/version/version.go:
+    // fmt.Printf("go version %s %s/%s\n", runtime.Version(), runtime.GOOS, runtime.GOARCH)
+    // expecting go<version> for runtime.Version()
+    let goVersionOutput = [...goVersion.split(' ')[2]].slice(2).join('');
+    core.setOutput('go-version', goVersionOutput);
+
     core.startGroup('go env');
     let goEnv = (cp.execSync(`${goPath} env`) || '').toString();
     core.info(goEnv);