add branch to CI - change branch-detection to support tags as well

.github/workflows/ci.yml

@@ -6,6 +6,7 @@ on:
       - master
       - develop
       - github_actions_tests
+      - reduce_requirements_files
     tags:
     release:
       types: [published]
@@ -226,7 +227,7 @@ jobs:
 
     - name: Extract branch name
       shell: bash
-      run: echo "##[set-output name=branch;]$(echo ${GITHUB_REF#refs/heads/})"
+      run: echo "##[set-output name=branch;]$(echo ${GITHUB_REF##*/})"
       id: extract_branch
 
     - name: Build distribution