fix typo and badges

Author: Marko Petric

.github/workflows/macos.yml

@@ -1,4 +1,4 @@
-name: macOS with cvmfs_repositories
+name: macOS
 on: [push, pull_request]
 jobs:
   macOS-minimal:

.github/workflows/minimal-usage.yml

@@ -1,4 +1,4 @@
-name: Minimal usage
+name: ubuntu
 on: [push, pull_request]
 jobs:
   build:

README.md

@@ -1,4 +1,6 @@
 # GitHub Action: cvmfs-contrib/github-action-cvmfs
+![ubuntu](https://github.com/cvmfs-contrib/github-action-cvmfs/workflows/ubuntu/badge.svg)![macOS](https://github.com/cvmfs-contrib/github-action-cvmfs/workflows/macOS/badge.svg)
+
 This GitHub Action sets up CernVM-FS for use in GitHub Workflows.
 
 ## Instructions
@@ -133,7 +135,7 @@ jobs:
   build:
     runs-on: ubuntu-latest
     steps:
-    - uses: petricm/github-action-cvmfs@add
+    - uses: cvmfs-contrib/github-action-cvmfs@main
     - name: Test CernVM-FS
       run: |
         ls /cvmfs/lhcb.cern.ch