Update workflow permissions

Set workflow permissions to none and add job-level permissions instead.

Author: martincostello

.github/workflows/benchmark.yml

@@ -19,14 +19,16 @@ on:
       - '**/*.md'
   workflow_dispatch:
 
-permissions:
-  contents: read
+permissions: {}
 
 jobs:
   benchmark:
     name: benchmark
     runs-on: ubuntu-latest
 
+    permissions:
+      contents: read
+
     steps:
 
     - name: Checkout code

.github/workflows/build.yml

@@ -14,8 +14,7 @@ on:
       - dotnet-nightly
   workflow_dispatch:
 
-permissions:
-  contents: read
+permissions: {}
 
 env:
   DOTNET_NOLOGO: true
@@ -30,6 +29,9 @@ jobs:
     name: ${{ matrix.os }}
     runs-on: ${{ matrix.os }}
 
+    permissions:
+      contents: read
+
     strategy:
       fail-fast: false
       matrix:

.github/workflows/lint.yml

@@ -14,8 +14,7 @@ on:
       - dotnet-nightly
   workflow_dispatch:
 
-permissions:
-  contents: read
+permissions: {}
 
 env:
   FORCE_COLOR: 3
@@ -25,6 +24,9 @@ jobs:
   lint:
     runs-on: ubuntu-latest
 
+    permissions:
+      contents: read
+
     steps:
 
     - name: Checkout code