Skip http-tests when no beacon endpoint configured

The http-tests job runs live integration tests against a beacon node. It hard
-failed on every PR because HTTP_ADDRESS/HTTP_TEST_CONCURRENCY are not set in
this fork. Gate the job on HTTP_ADDRESS so it skips cleanly when unconfigured
and runs automatically if the variable is ever set; drop the now-redundant
validation step.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

Author: KaloyanTanev

.github/workflows/http-tests.yml

@@ -7,6 +7,9 @@ on:
 jobs:
   test:
     runs-on: ubuntu-24.04
+    # These are live integration tests that need a beacon node HTTP endpoint.
+    # Skip cleanly when it is not configured; runs automatically once it is.
+    if: vars.HTTP_ADDRESS != ''
     steps:
       - name: Checkout code
         uses: actions/checkout@v4
@@ -16,17 +19,6 @@ jobs:
         with:
           go-version: '1.25.2'
 
-      - name: Validate required variables
-        run: |
-          if [ -z "${{ vars.HTTP_ADDRESS }}" ]; then
-            echo "Error: HTTP_ADDRESS variable is not set in repository variables"
-            exit 1
-          fi
-          if [ -z "${{ vars.HTTP_TEST_CONCURRENCY }}" ]; then
-            echo "Error: HTTP_TEST_CONCURRENCY variable is not set in repository variables"
-            exit 1
-          fi
-
       - name: Run HTTP tests
         env:
           HTTP_ADDRESS: ${{ vars.HTTP_ADDRESS }}