Fix security issues

.github/workflows/build.yml

@@ -13,6 +13,9 @@ concurrency:
   group: build-${{ github.ref }}
   cancel-in-progress: true
 
+permissions:
+  contents: read
+
 jobs:
   build:
     name: Build (${{ matrix.os }})

.github/workflows/deploy.yml

@@ -23,6 +23,9 @@ concurrency:
   group: "pages"
   cancel-in-progress: false
 
+permissions:
+  contents: read
+
 jobs:
   deploy:
     runs-on: self-hosted