[CI] Use login shells for macOS.

To reliably set up the enviroment, use bash as a login shell for all
workflow steps on mac. This ensures that settings from ~/.bash_profile
are visible in all steps of the workflow.

Author: hageboeck

.github/workflows/root-ci.yml

@@ -97,6 +97,10 @@ jobs:
     permissions:
       contents: read
 
+    defaults:
+      run:
+        shell: bash -leo pipefail {0} # Use login shell, so profile scripts get sourced
+
     strategy:
       fail-fast: false
       matrix:
@@ -141,7 +145,6 @@ jobs:
         run: 'echo SSL_CERT_FILE=/opt/local/share/curl/curl-ca-bundle.crt >> $GITHUB_ENV'
 
       - name: Pull Request Build
-        shell: bash -leo pipefail {0}
         if: github.event_name == 'pull_request'
         env:
           HOME: /Users/sftnight
@@ -161,7 +164,6 @@ jobs:
                     --overrides       ${GLOBAL_OVERRIDES} ${OVERRIDES}"
 
       - name: Workflow dispatch
-        shell: bash -leo pipefail {0}
         if: ${{ github.event_name == 'workflow_dispatch' && !matrix.is_special }}
         run: ".github/workflows/root-ci-config/build_root.py
                     --buildtype      ${{ inputs.buildtype }}
@@ -173,7 +175,6 @@ jobs:
                     --repository     ${{ github.server_url }}/${{ github.repository }}"
 
       - name: Nightly build
-        shell: bash -leo pipefail {0}
         if:   github.event_name == 'schedule'
         run: ".github/workflows/root-ci-config/build_root.py
                     --buildtype      Release
@@ -184,7 +185,6 @@ jobs:
                     --repository     ${{ github.server_url }}/${{ github.repository }}"
 
       - name: Update build cache after push to release branch
-        shell: bash -leo pipefail {0}
         if:   github.event_name == 'push'
         env:
           OVERRIDES: ${{ join( matrix.overrides, ' ') }}