fix(bazel): better PR change description

lib/config/definitions.js

@@ -955,11 +955,9 @@ const options = [
     default: {
       rollbackPrs: false,
       fileMatch: ['(^|/)WORKSPACE$'],
-      major: {
-        prBodyDefinitions: {
-          Change:
-            '{{#if currentDigest}}digest -> `{{{newVersion}}}`{{else}}`{{{currentValue}}}` -> `{{{newValue}}}`{{/if}}',
-        },
+      prBodyDefinitions: {
+        Change:
+          '{{#if currentDigestShort}}`{{{currentDigestShort}}}` -> {{#if isDigest}}`{{{newDigestShort}}}`{{else}}`{{{newVersion}}}`{{/if}}{{else}}`{{{currentValue}}}` -> `{{{newValue}}}`{{/if}}',
       },
     },
     mergeable: true,

lib/manager/bazel/extract.js

@@ -104,6 +104,7 @@ function extractPackageFile(content) {
       if (commit) {
         dep.currentValue = 'v0.0.0';
         dep.currentDigest = commit;
+        dep.currentDigestShort = commit.substr(0, 7);
         dep.digestOneAndOnly = true;
       }
       deps.push(dep);

test/manager/bazel/__snapshots__/extract.spec.js.snap

@@ -17,6 +17,7 @@ Array [
   },
   Object {
     "currentDigest": "dec09d789f3dba190787f8b4454c7d3c936fed9e",
+    "currentDigestShort": "dec09d7",
     "currentValue": "v0.0.0",
     "def": "go_repository(
    name = \\"com_github_google_uuid\\",