Set GITHUB_BRANCH_NAME early

Author: mathbunnyru

.github/actions/cmake/action.yml

@@ -58,9 +58,7 @@ runs:
         TIME_TRACE: "${{ inputs.time_trace == 'true' && 'ON' || 'OFF' }}"
         PACKAGE: "${{ inputs.package == 'true' && 'ON' || 'OFF' }}"
         # GitHub creates merge commits for PRS, so we:
-        # - explicitly provide branch name
         # - provide `github.head_ref` to get the actual commit SHA of the PR branch.
-        GITHUB_BRANCH_NAME: "${{ github.head_ref || github.ref_name }}"
         GITHUB_HEAD_SHA: "${{ github.event.pull_request.head.sha || github.sha }}"
       run: |
         cmake \

.github/workflows/reusable-build.yml

@@ -85,6 +85,10 @@ jobs:
     runs-on: ${{ inputs.runs_on }}
     container: ${{ inputs.container != '' && fromJson(inputs.container) || null }}
 
+    env:
+      # The way we checkout the code overrides github.head_ref, so we need to set the branch name manually
+      GITHUB_BRANCH_NAME: "${{ github.head_ref || github.ref_name }}"
+
     steps:
       - name: Cleanup workspace
         if: ${{ runner.os == 'macOS' }}