Use clang instead of gcc; Adjust CI flags

Signed-off-by: Jonh Wendell <jwendell@redhat.com>

Author: jwendell

.github/workflows/envoy-openssl.yml

@@ -25,11 +25,11 @@ jobs:
       uses: envoyproxy/toolshed/gh-actions/diskspace@actions-v0.3.28
     - uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683  # v4.2.2
     - run: |
-        ./ci/run_envoy_docker.sh './ci/do_ci.sh gcc @bssl-compat//test/... //test/...'
+        ./ci/run_envoy_docker.sh './ci/do_ci.sh dev @bssl-compat//test/... //test/...'
       env:
         BAZEL_BUILD_EXTRA_OPTIONS: >-
-          --config=remote-envoy-engflow
-          --config=bes-envoy-engflow
+          --config=rbe
+          --config=bes
           --config=remote-ci
           --config=openssl
         ENVOY_RBE: 1
@@ -51,8 +51,8 @@ jobs:
         ./ci/run_envoy_docker.sh './ci/do_ci.sh dev //test/...'
       env:
         BAZEL_BUILD_EXTRA_OPTIONS: >-
-          --config=remote-envoy-engflow
-          --config=bes-envoy-engflow
+          --config=rbe
+          --config=bes
           --config=remote-ci
         ENVOY_RBE: 1
         GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}