Add minimum token permissions for all github workflow files (#1655)

* Add minimum token permissions for all github workflow files

* Update .github/workflows/phpdoc-to-github-pages.yml

---------

Co-authored-by: otelbot <197425009+otelbot@users.noreply.github.com>
Co-authored-by: Trask Stalnaker <trask.stalnaker@gmail.com>

.github/workflows/php.yml

@@ -6,6 +6,9 @@ on:
   pull_request:
     branches: [ main ]
 
+permissions:
+  contents: read
+
 jobs:
   php:
     runs-on: ubuntu-latest

.github/workflows/phpdoc-to-github-pages.yml

@@ -6,14 +6,14 @@ on:
       - "main"
   workflow_dispatch:
 
-# Sets permissions of the GITHUB_TOKEN to allow deployment to GitHub Pages
 permissions:
   contents: read
-  pages: write
-  id-token: write
 
 jobs:
   documentation:
+    permissions:
+      pages: write # required for GitHub Pages deployment
+      id-token: write # required for GitHub Pages deployment
     name: "Documentation"
     runs-on: "ubuntu-latest"
     steps:

.github/workflows/publish-otel-php-base-docker-image.yml

@@ -11,6 +11,8 @@ on:
     paths:
       - docker/Dockerfile
       - .github/workflows/publish-otel-php-base-docker-image.yml
+permissions:
+  contents: read
 jobs:
   push_to_registry:
     name: OpenTelemetry PHP base docker image creation

.github/workflows/shellcheck.yml

@@ -6,6 +6,9 @@ on:
   pull_request:
     branches: [ main ]
 
+permissions:
+  contents: read
+
 jobs:
   shellcheck:
     runs-on: ubuntu-latest

.github/workflows/split-monorepo.yaml

@@ -9,6 +9,9 @@ on:
   create:
   workflow_dispatch:
 
+permissions:
+  contents: read
+
 jobs:
   gitsplit:
     runs-on: ubuntu-latest