Add missing permissions to GitHub workflows

Author: williamdes

.github/workflows/lint-and-analyse-php.yml

@@ -1,5 +1,8 @@
 name: Lint and analyse php files
 
+permissions:
+  contents: read
+
 on:
   push:
   pull_request:

.github/workflows/lint-docs.yml

@@ -1,5 +1,8 @@
 name: Lint PHP documentation
 
+permissions:
+  contents: read
+
 on:
   push:
   pull_request:

.github/workflows/mutation-tests.yml

@@ -1,5 +1,8 @@
 name: Mutation tests
 
+permissions:
+  contents: read
+
 on:
   push:
     branches: [ master ]

.github/workflows/tests.yml

@@ -1,5 +1,8 @@
 name: Run tests
 
+permissions:
+  contents: read
+
 on:
   push:
   pull_request: