Update workflows to include permissions (#43)

Added permissions for read access to contents.

Author: sbooth

.github/workflows/clang-format-check.yml

@@ -4,6 +4,8 @@ on:
     branches: [ "main" ]
   pull_request:
     branches: [ "main" ]
+permissions:
+  contents: read
 jobs:
   formatting-check:
     name: Formatting Check

.github/workflows/swift.yml

@@ -1,16 +1,14 @@
 name: Swift
-
 on:
   push:
     branches: [ "main" ]
   pull_request:
     branches: [ "main" ]
-
+permissions:
+  contents: read
 jobs:
   build:
-
     runs-on: macos-latest
-
     steps:
     - name: Set Xcode version
       uses: maxim-lobanov/setup-xcode@v1