feat(outputs): app-slug and installation-id (#105)

It is convenient to use `https://api.github.com/users/$app_slug[bot]` to
obtain the corresponding account ID later.
Then build `Signed-off-by: $app_slug[bot]
<$id+$app_slug[bot]@users.noreply.github.com>`.

Currently, there is no Linux environment to build test snapshot files

lib/main.js

@@ -70,35 +70,36 @@ export async function main(
     request,
   });
 
-  let authentication;
+  let authentication, installationId, appSlug;
   // If at least one repository is set, get installation ID from that repository
 
   if (parsedRepositoryNames) {
-    authentication = await pRetry(() => getTokenFromRepository(request, auth, parsedOwner, parsedRepositoryNames), {
+    ({ authentication, installationId, appSlug } = await pRetry(() => getTokenFromRepository(request, auth, parsedOwner, parsedRepositoryNames), {
       onFailedAttempt: (error) => {
         core.info(
           `Failed to create token for "${parsedRepositoryNames}" (attempt ${error.attemptNumber}): ${error.message}`
         );
       },
       retries: 3,
-    });
-
+    }));
   } else {
     // Otherwise get the installation for the owner, which can either be an organization or a user account
-    authentication = await pRetry(() => getTokenFromOwner(request, auth, parsedOwner), {
+    ({ authentication, installationId, appSlug } = await pRetry(() => getTokenFromOwner(request, auth, parsedOwner), {
       onFailedAttempt: (error) => {
         core.info(
           `Failed to create token for "${parsedOwner}" (attempt ${error.attemptNumber}): ${error.message}`
         );
       },
       retries: 3,
-    });
+    }));
   }
 
   // Register the token with the runner as a secret to ensure it is masked in logs
   core.setSecret(authentication.token);
 
   core.setOutput("token", authentication.token);
+  core.setOutput("installation-id", installationId);
+  core.setOutput("app-slug", appSlug);
 
   // Make token accessible to post function (so we can invalidate it)
   if (!skipTokenRevoke) {
@@ -132,7 +133,11 @@ async function getTokenFromOwner(request, auth, parsedOwner) {
     type: "installation",
     installationId: response.data.id,
   });
-  return authentication;
+
+  const installationId = response.data.id;
+  const appSlug = response.data['app_slug'];
+
+  return { authentication, installationId, appSlug };
 }
 
 async function getTokenFromRepository(request, auth, parsedOwner, parsedRepositoryNames) {
@@ -152,5 +157,8 @@ async function getTokenFromRepository(request, auth, parsedOwner, parsedReposito
     repositoryNames: parsedRepositoryNames.split(","),
   });
 
-  return authentication;
-}
+  const installationId = response.data.id;
+  const appSlug = response.data['app_slug'];
+
+  return { authentication, installationId, appSlug };
+ }