feat: add support for github token

.github/workflows/rhub.yaml

@@ -6,6 +6,11 @@ name: R-hub 🌐
 
 on:
   workflow_call:
+    secrets:
+      REPO_GITHUB_TOKEN:
+        description: |
+          Github token with read access to repositories
+        required: false
     inputs:
       config:
         description: 'A comma separated list of R-hub platforms to use.'
@@ -71,6 +76,18 @@ jobs:
       image: ${{ matrix.config.container }}
 
     steps:
+      - name: Setup token 🔑
+        id: github-token
+        run: |
+          if [ "${{ secrets.REPO_GITHUB_TOKEN }}" == "" ]; then
+            echo "REPO_GITHUB_TOKEN is empty. Substituting it with GITHUB_TOKEN."
+            echo "token=${{ secrets.GITHUB_TOKEN }}" >> $GITHUB_OUTPUT
+          else
+            echo "Using REPO_GITHUB_TOKEN."
+            echo "token=${{ secrets.REPO_GITHUB_TOKEN }}" >> $GITHUB_OUTPUT
+          fi
+        shell: bash
+
       - uses: r-hub/actions/checkout@v1
 
       - uses: r-hub/actions/platform-info@v1
@@ -91,6 +108,8 @@ jobs:
           token: ${{ secrets.RHUB_TOKEN }}
           job-config: ${{ matrix.config.job-config }}
           needs: DepsDev,DepsBranch
+        env:
+          GITHUB_PAT: ${{ steps.github-token.outputs.token }}
 
       - uses: r-hub/actions/run-check@v1
         with: