Add explicit permissions to GitHub workflows (#208)

Author: labkey-tchad

.github/workflows/branch_release.yml

@@ -8,6 +8,10 @@ on:
     tags:
       - '*'
 
+permissions:
+  pull-requests: write
+  contents: write
+
 jobs:
   branch_release:
     if: github.event.created && github.event.sender.login == 'labkey-teamcity'

.github/workflows/merge_release.yml

@@ -8,6 +8,10 @@ on:
     types:
       - submitted
 
+permissions:
+  pull-requests: write
+  contents: write
+
 jobs:
   merge_release:
     if: >

.github/workflows/validate_pr.yml

@@ -10,6 +10,9 @@ on:
       - reopened
       - ready_for_review
 
+permissions:
+  pull-requests: read
+
 jobs:
   validate_pr:
     if: github.event.pull_request.head.repo.owner.login == 'LabKey'