Fix #403: Catch the error thrown in pre and post steps (#407)

* fix #403

* modify error handling

src/cleanup.ts

@@ -10,7 +10,7 @@ async function cleanup() {
         }
     }
     catch (error) {
-        core.setFailed(`Login cleanup failed with ${error}. Make sure 'az' is installed on the runner. If 'enable-AzPSSession' is true, make sure 'pwsh' is installed on the runner together with Azure PowerShell module.`);
+        core.warning(`Login cleanup failed with ${error}. Cleanup will be skipped.`);
         core.debug(error.stack);
     }
 }

src/common/Utils.ts

@@ -13,19 +13,13 @@ export function setUserAgent(): void {
 
 export async function cleanupAzCLIAccounts(): Promise<void> {
     let azPath = await io.which("az", true);
-    if (!azPath) {
-        throw new Error("Azure CLI is not found in the runner.");
-    }
     core.debug(`Azure CLI path: ${azPath}`);
     core.info("Clearing azure cli accounts from the local cache.");
     await exec.exec(`"${azPath}"`, ["account", "clear"]);  
 }
 
 export async function cleanupAzPSAccounts(): Promise<void> {
     let psPath: string = await io.which(AzPSConstants.PowerShell_CmdName, true);
-    if (!psPath) {
-        throw new Error("PowerShell is not found in the runner.");
-    }
     core.debug(`PowerShell path: ${psPath}`);
     core.debug("Importing Azure PowerShell module.");
     AzPSUtils.setPSModulePathForGitHubRunner();