added gmt_tools key to weekly_tests

.github/workflows/weeklytests.yml

@@ -15,6 +15,12 @@ jobs:
       matrix: ${{ steps.set-matrix.outputs.matrix }}
     steps:
     - uses: actions/checkout@v3
+      with:
+        # This is a personal access token with access to the gmt_tools repo.
+        # It is stored as a repo secret in BFASST and a dependabot secret in BFASST
+        # (for PRs generated by dependabot).
+        token: ${{ secrets.GMT_TOOLS_PAT }}
+        submodules: 'recursive'
     - id: set-matrix
       run: |
         echo "matrix=$(ls experiments/weekly_tests/*.yaml | jq -R -s -c 'split("\n")[:-1]')" >> $GITHUB_OUTPUT