chore: update test CI/CD for FORK_URL env (#230)

## Description

This PR sets the `FORK_URL` environment variable to a mainnet archive
node with sufficient RPS / capacity to facilitate the fork tests.

## Test Plan

1. Verify CI/CD green.

## Related Issues

N/A

.github/workflows/test.yml

@@ -70,5 +70,9 @@ jobs:
       - name: Run Forge tests
         if: matrix.profile != 'solc-0.7.6'
         run: |
+          if [ "${{ matrix.profile }}" == "default" ]; then
+            echo "Setting FORK_URL for default profile"
+            export FORK_URL="${{ secrets.MAINNET_ARCHIVE_RPC }}"
+          fi
           FOUNDRY_PROFILE=ci forge test -vvv
         id: test