fix gh workflow

Author: faressc

.github/workflows/build_docs_and_deploy.yml

@@ -11,8 +11,6 @@ on:
 
 env:
   SCCACHE_GHA_ENABLED: "true"
-  matrix.name: "Linux-x86_64"
-  matrix.os: "ubuntu-latest"
 
 # When pushing new commits, cancel any workflows with the same name on that branch
 concurrency:
@@ -21,7 +19,7 @@ concurrency:
 
 jobs:
   build_docs:
-    runs-on: ${{ matrix.os }}
+    runs-on: ubuntu-latest
     steps:
       - name: get repo and submodules
         uses: actions/checkout@v4