ci(docker): run tests/docker/ in build-amd64 against the freshly-built image

The new tests/docker/ suite (added by this PR) was being picked up by the
sharded pytest matrix in tests.yml, where its session-scoped `built_image`
fixture issued a 3-7min `docker build` under tests/docker/conftest.py's
180s pytest-timeout cap. Every test in the directory failed in fixture
setup across all 6 shards.

Fix the suite so it actually runs (not skips):

1. Wire the docker tests into docker-publish.yml's build-amd64 job, right
   after the existing smoke test. The image is already loaded into the
   local daemon as `nousresearch/hermes-agent:test`; set
   HERMES_TEST_IMAGE to that and the fixture's pre-built-image branch
   short-circuits the rebuild. 21 tests run in ~90s locally against a
   prebuilt image, no rebuild cost on top of the existing build step.

2. Exclude tests/docker/ from scripts/run_tests_parallel.py's default
   discovery so the sharded matrix in tests.yml stops trying to build
   the image. Explicit positional paths (`pytest tests/docker/` or
   `scripts/run_tests.sh tests/docker/`) still pick the suite up — the
   skip rule honors directory-level user intent, matching the existing
   per-file override pattern.

The dedicated docker-tests step runs on every PR that touches docker
code (the existing path filters on docker-publish.yml already cover
`tests/docker/**` via `**/*.py`), so the suite gates real changes.

(cherry picked from commit 4c481860ce)

.github/workflows/docker-publish.yml

@@ -80,6 +80,56 @@ jobs:
         with:
           image: ${{ env.IMAGE_NAME }}:test
 
+      # ---------------------------------------------------------------------
+      # Run the docker-integration test suite against the freshly-built
+      # image already loaded into the local daemon (`:test`).  These tests
+      # are excluded from the sharded `tests.yml :: test` matrix on purpose
+      # (see `_SKIP_PARTS` in scripts/run_tests_parallel.py) because each
+      # shard would otherwise reach the session-scoped ``built_image``
+      # fixture in ``tests/docker/conftest.py`` and start a 3-7min
+      # ``docker build`` under a 180s pytest-timeout cap — guaranteed to
+      # die in fixture setup.
+      #
+      # Piggybacking here avoids a second image build: the smoke test
+      # already proved the image loads + runs, so the daemon has it under
+      # `${IMAGE_NAME}:test` and we just point ``HERMES_TEST_IMAGE`` at
+      # that.  The fixture's ``HERMES_TEST_IMAGE`` branch (see
+      # tests/docker/conftest.py:62-63) short-circuits the rebuild.
+      #
+      # Why this job and not a standalone one: the image is 5GB+; passing
+      # it between jobs via ``docker save``/``upload-artifact`` is slower
+      # than the build itself.  Reusing the existing daemon state is the
+      # cheapest path to coverage on every PR that touches docker code.
+      # ---------------------------------------------------------------------
+      - name: Install uv (for docker tests)
+        uses: astral-sh/setup-uv@d4b2f3b6ecc6e67c4457f6d3e41ec42d3d0fcb86  # v5
+
+      - name: Set up Python 3.11 (for docker tests)
+        run: uv python install 3.11
+
+      - name: Install Python dependencies (for docker tests)
+        run: |
+          uv venv .venv --python 3.11
+          source .venv/bin/activate
+          # ``dev`` extra pulls in pytest, pytest-asyncio, pytest-timeout —
+          # everything tests/docker/ needs.  We deliberately avoid ``all``
+          # here because the docker tests only drive the container via
+          # subprocess and don't import hermes_agent's optional deps.
+          uv pip install -e ".[dev]"
+
+      - name: Run docker integration tests
+        env:
+          # Skip rebuild; use the image already loaded by the build step.
+          HERMES_TEST_IMAGE: ${{ env.IMAGE_NAME }}:test
+          # Match the policy in tests.yml :: test job — no accidental
+          # real-API calls from inside the harness.
+          OPENROUTER_API_KEY: ""
+          OPENAI_API_KEY: ""
+          NOUS_API_KEY: ""
+        run: |
+          source .venv/bin/activate
+          python -m pytest tests/docker/ -v --tb=short
+
       - name: Log in to Docker Hub
         if: github.event_name == 'push' && github.ref == 'refs/heads/main' || github.event_name == 'release'
         uses: docker/login-action@4907a6ddec9925e35a0a9e82d7399ccc52663121  # v4.1.0