[#59] Limit commit sha to 8 characters

__tests__/client.test.ts

@@ -38,7 +38,9 @@ const commit = (): Field => {
   return {
     short: true,
     title: 'commit',
-    value: `<https://github.com/8398a7/action-slack/commit/${process.env.GITHUB_SHA}|${process.env.GITHUB_SHA}>`,
+    value: `<https://github.com/8398a7/action-slack/commit/${
+      process.env.GITHUB_SHA
+    }|${process.env.GITHUB_SHA?.slice(0, 8)}>`,
   };
 };
 

src/client.ts

@@ -174,7 +174,10 @@ export class Client {
 
     return {
       title: 'commit',
-      value: `<https://github.com/${owner}/${repo}/commit/${sha}|${sha}>`,
+      value: `<https://github.com/${owner}/${repo}/commit/${sha}|${sha.slice(
+        0,
+        8,
+      )}>`,
       short: true,
     };
   }