GHA: update RHEL workflow

Use RHEL 8, drop RHEL 7 because it cannot run the nodejs 20 actions.

Author: gaborcsardi

.github/workflows/rhel.yaml

@@ -13,8 +13,10 @@ jobs:
       fail-fast: false
       matrix:
         config:
-          - { os: rhel7, r: 'release', key: '${{ secrets.REDHAT_ACTIVATION_KEY_RHEL7 }}' }
-          - { os: rhel8, r: 'release', key: '${{ secrets.REDHAT_ACTIVATION_KEY_RHEL8 }}' }
+          # cannot run the nodejs actions because RHEL7 cannot run node20
+          # - { os: rhel7, r: release, key: REDHAT_ACTIVATION_KEY_RHEL7 }
+          - { os: rhel8, r: release, key: REDHAT_ACTIVATION_KEY_RHEL8 }
+          - { os: rhel9, r: release, key: REDHAT_ACTIVATION_KEY_RHEL9 }
     container:
       image: ghcr.io/r-hub/containers/${{ matrix.config.os }}:latest
 
@@ -25,10 +27,11 @@ jobs:
         run: |
           subscription-manager register \
             --org ${{ secrets.REDHAT_ORG }} \
-            --activationkey ${{ matrix.config.key }}
+            --activationkey ${{ secrets[matrix.config.key] }}
         shell: bash
 
       - name: Install R
+        if: ${{ matrix.config.r != 'release' }}
         run: |
           rig add ${{ matrix.config.r }}
         shell: bash