github actions only on main branch

.github/workflows/ci.yml

@@ -6,7 +6,6 @@ on:
     # # relevant branches and tags. Other branches can be checked via PRs.
     branches:
       - "main"
-      - "*"
     tags: ["v[0-9]*", "[0-9]+.[0-9]+*"] # Match tags that resemble a version
   pull_request: # Run in every PR
   workflow_dispatch: # Allow manually triggering the workflow
@@ -106,7 +105,7 @@ jobs:
           - ubuntu-latest
           # - macos-latest  # graphviz would not install (2023-12-08)
           - windows-latest
-      fail-fast: false  # https://docs.github.com/en/actions/using-workflows/workflow-syntax-for-github-actions#jobsjob_idstrategyfail-fast
+      fail-fast: false # https://docs.github.com/en/actions/using-workflows/workflow-syntax-for-github-actions#jobsjob_idstrategyfail-fast
     runs-on: ${{ matrix.platform }}
     steps:
       - uses: actions/checkout@v3