fix: use direct comparison

Author: michaelwenk

.github/workflows/build-and-upload-docker-image.yml

@@ -12,7 +12,7 @@ jobs:
     steps:
       - uses: actions/checkout@v3
       - name: exit if not on master branch
-        if: match(${{ github.ref_name }}, '/v\d\.\d\.\d/') == false
+        if: github.ref_name != 'master'
         run: exit -1
       - name: Login to Docker Hub
         uses: docker/login-action@v2