chore: grant access for bots to push tags and create issues for release workflows

Author: ldetmer

.github/workflows/jib-cli-release.yml

@@ -7,6 +7,10 @@ on:
         required: true
         default: (for example, 0.1.0)
 
+permissions:
+  contents: write
+  issues: write
+
 jobs:
   release:
     name: Release Jib CLI

.github/workflows/prepare-release.yml

@@ -11,6 +11,10 @@ on:
         required: true
         default: (for example, 0.1.0)
 
+permissions:
+  contents: write
+  issues: write
+
 jobs:
   release:
     name: Prepare Jib release