DPC-5222 re-enable portal smoke test at new subdomain (#2936)

## 🎫 Ticket

https://jira.cms.gov/browse/DPC-5222

## 🛠 Changes

- PACE certificate added to github runner trust store
- Portal tests re-enabled

## ℹ️ Context

We had to disable the smoke tests on the portal when we got the custom
subdomains, as we needed to do some infrastructure updates for the
runner to be able to hit them.

## 🧪 Validation

Smoke tests successfully test the portal:
https://github.com/CMSgov/dpc-app/actions/runs/22772177949

Author: jdettmannnava

.github/workflows/smoke-test.yml

@@ -63,6 +63,12 @@ jobs:
       - uses: actions/setup-go@d35c59abb061a4a6fb18e82ac0862c26744d6ab5 # v5.5.0
         with:
           go-version: '1.24.x'
+      - name: Install PACE cert
+        env:
+          PACE_CERT: ${{ secrets.PACE_CERT }}
+        run: |
+          echo "${PACE_CERT}" > /etc/pki/ca-trust/source/anchors/pace.pem
+          update-ca-trust
       - name: Build K6
         run: |
           # Install xk6

dpc-load-testing/smoke_test_workflows/portals.js

@@ -14,8 +14,7 @@ const portals = {
            signInPath: 'users/sign_in',
            protectedPath: 'organizations/foo/edit',
            signInText: 'Log in' },
-  // TODO: Add PACE cert when running in GHA (DPC-5222) and add 'dev' and 'test' back
-  'portal': { envs: ['local',],
+  'portal': { envs: ['local', 'dev', 'test'],
               signInPath: 'users/sign_in',
               protectedPath: 'organizations',
               signInText: 'Sign in' },