Set environment variables in rhub workflow

Add environment variables for GitHub and ENTSOE tokens

Author: sbudai

.github/workflows/rhub.yaml

@@ -31,6 +31,11 @@ jobs:
       containers: ${{ steps.rhub-setup.outputs.containers }}
       platforms: ${{ steps.rhub-setup.outputs.platforms }}
 
+    env:
+      GITHUB_PAT: ${{ secrets.GITHUB_TOKEN }}
+      ENTSOE_PAT: ${{ secrets.ENTSOE_PAT }}
+      R_KEEP_PKG_SOURCE: yes
+
     steps:
     # NO NEED TO CHECKOUT HERE
     - uses: r-hub/actions/setup@v1