fix: add permissions to backend caller workflows (#146)

Co-authored-by: Junyi Hou <junyi@xtras3.tail08d22c.ts.net>
Co-authored-by: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: 3 people

.github/workflows/build-backend-dev.yml

@@ -4,6 +4,10 @@ on:
     branches:
       - development
 
+permissions:
+  contents: write
+  packages: write
+
 jobs:
   build-and-deploy:
     uses: ./.github/workflows/_build-backend.yml

.github/workflows/build-backend-prd.yml

@@ -3,6 +3,10 @@ on:
   repository_dispatch:
     types: [prd]
 
+permissions:
+  contents: write
+  packages: write
+
 jobs:
   build-and-deploy:
     uses: ./.github/workflows/_build-backend.yml

.github/workflows/build-backend-stg.yml

@@ -3,6 +3,10 @@ on:
   repository_dispatch:
     types: [stg]
 
+permissions:
+  contents: write
+  packages: write
+
 jobs:
   build-and-deploy:
     uses: ./.github/workflows/_build-backend.yml