fix cache dir issue

.github/workflows/versions.yml

@@ -25,7 +25,7 @@ jobs:
         go-version: ^1.13.6
 
     - name: validate version 
-      run: go version | grep "go1.13."
+      run: go version | grep "go1."
 
     - name: setup-go 1.13
       uses: ./
@@ -42,3 +42,8 @@ jobs:
 
     - name: validate version 
       run: go version | grep "go1.12.9"
+
+    - name: show cache
+      run: |
+        echo go versions in tool cache: 
+        echo $(ls $RUNNER_TOOL_CACHE/go)       

dist/index.js

@@ -4601,7 +4601,7 @@ function downloadGo(versionSpec, stable) {
                 core_1.debug(`extracted to ${extPath}`);
                 // extracts with a root folder that matches the fileName downloaded
                 const toolRoot = path.join(extPath, 'go');
-                toolPath = yield tc.cacheDir(toolRoot, 'go', versionSpec);
+                toolPath = yield tc.cacheDir(toolRoot, 'go', match.version);
             }
         }
         catch (error) {

src/installer.ts

@@ -33,7 +33,7 @@ export async function downloadGo(
 
       // extracts with a root folder that matches the fileName downloaded
       const toolRoot = path.join(extPath, 'go');
-      toolPath = await tc.cacheDir(toolRoot, 'go', versionSpec);
+      toolPath = await tc.cacheDir(toolRoot, 'go', match.version);
     }
   } catch (error) {
     throw new Error(`Failed to download version ${versionSpec}: ${error}`);