Add secret SSH key for saturn repo access

.github/actions/prepare-rtl/action.yml

@@ -35,6 +35,7 @@ runs:
         conda activate ${{ env.conda-env-name-no-time }}-$(date --date "${{ env.workflow-timestamp }}" +%Y%m%d)-${{ inputs.toolchain }}
         if [[ "${{ steps.rtl-build-id.outputs.cache-hit }}" != 'true' ]]; then
           echo "Cache miss on ${{ inputs.group-key }}-${{ github.sha }}"
+          ssh-add - <<< "${{ secrets.SATURN_SECRET }}"
           ./.github/scripts/${{ inputs.build-script }} ${{ inputs.group-key }} ${{ inputs.build-type }}
         else
           echo "Cache hit do not rebuild RTL for ${{ inputs.group-key }}"

.github/workflows/chipyard-full-flow.yml

@@ -81,6 +81,7 @@ jobs:
         run: |
           cd ${{ env.REMOTE_WORK_DIR }}
           eval "$(conda shell.bash hook)"
+          ssh-add - <<< "${{ secrets.SATURN_SECRET }}"
           mkdir ${{ env.JAVA_TMP_DIR }}
           export MAKEFLAGS="-j32"
           ./build-setup.sh -v

.github/workflows/chipyard-run-tests.yml

@@ -117,6 +117,7 @@ jobs:
       - name: Check commits of each submodule
         run: |
             conda activate ${{ env.conda-env-name-no-time }}-$(date --date "${{ env.workflow-timestamp }}" +%Y%m%d)-riscv-tools
+            ssh-add - <<< "${{ secrets.SATURN_SECRET }}"
             .github/scripts/check-commit.sh
 
   documentation-check: