[FIX] allow tags/releases from main branch

Set fixed env.BRANCH_NAME to main.

Relates: #3995

.github/workflows/ci.yml

@@ -23,6 +23,7 @@ env:
   TESTING_SOLR_PORT: 8983
   LOCAL_VOLUME_NAME: 'solrci-volume'
   LOCAL_VOLUME_PATH: '/home/runner/work/ext-solr/ext-solr/.Build/data-solr'
+  BRANCH_NAME: 'main'
 
 jobs:
   ci_bootstrapping:
@@ -46,28 +47,6 @@ jobs:
         if: ${{ github.event_name == 'push' || github.event_name == 'schedule' }}
         uses: actions/checkout@v4
       # End: Workaround for issue with actions/checkout...
-      -
-        name: "Resolve target branch of pull request."
-        if: github.event_name == 'pull_request'
-        run: |
-          echo "BRANCH_NAME=${{ github.event.pull_request.base.ref }}" >> $GITHUB_ENV
-      -
-        name: "Resolve branch name on push in branch of repository."
-        if: ${{ !startsWith(github.ref, 'refs/tags/') && (github.event_name == 'push' || github.event_name == 'schedule') }}
-        run: |
-          echo "BRANCH_NAME=${GITHUB_REF#refs/heads/}" >> $GITHUB_ENV
-      -
-        # We want to pass tests before the tag/release can be pushed to TER.
-        # This step resolves the branch name of the tag to use, to be able to collect proper build matrix values.
-        name: "Resolve branch name on release/tag in branch of repository."
-        if: startsWith(github.ref, 'refs/tags/')
-        # //[!0-9]/ in script below removes possible "v" prefix from major part,
-        #   to prevent errors or make it possible to create tags with "v" or other prefixes.
-        run: |
-          export RELEASE_VERSION=${GITHUB_REF/refs\/tags\//}
-          export MAJOR_MINOR_VERSIONS_STRING=$(v=( ${RELEASE_VERSION//./ } ) && echo "${v[0]//[!0-9]/}.${v[1]}")
-          export BRANCH_NAME=release-"$MAJOR_MINOR_VERSIONS_STRING".x
-          echo "BRANCH_NAME=$BRANCH_NAME" >> $GITHUB_ENV
       -
         name: Collect build matrix
         id: collect_build_matrix
@@ -110,7 +89,7 @@ jobs:
     needs: ci_bootstrapping
     continue-on-error: ${{ contains(matrix.TYPO3, '-dev') }}
     strategy:
-      matrix: ${{fromJson(needs.ci_bootstrapping.outputs.matrix)}}
+      matrix: ${{ fromJson(needs.ci_bootstrapping.outputs.matrix) }}
     env:
       TYPO3_DATABASE_NAME: 'typo3_ci'
       TYPO3_DATABASE_HOST: '127.0.0.1'