Implementation of caching functionality for setup-go action (#228)

src/package-managers.ts

@@ -0,0 +1,15 @@
+type SupportedPackageManagers = {
+  [prop: string]: PackageManagerInfo;
+};
+
+export interface PackageManagerInfo {
+  dependencyFilePattern: string;
+  cacheFolderCommandList: string[];
+}
+
+export const supportedPackageManagers: SupportedPackageManagers = {
+  default: {
+    dependencyFilePattern: 'go.sum',
+    cacheFolderCommandList: ['go env GOMODCACHE', 'go env GOCACHE']
+  }
+};