Add build-executable-ubuntu CI job.

.github/workflows/build.yml

@@ -21,3 +21,33 @@ jobs:
         with:
           name: "dist-${{ matrix.os }}"
           path: dist/
+
+  build-executable-ubuntu:
+    runs-on: ubuntu-latest
+
+    steps:
+      - uses: actions/checkout@v4
+
+      - uses: docker/setup-buildx-action@v3
+
+      - uses: docker/build-push-action@v5
+        with:
+          context: .
+          file: "Dockerfile"
+          tags: romt_build:latest
+          load: true
+          cache-from: type=gha
+          cache-to: type=gha,mode=max
+          push: false
+
+      - name: Run Romt build container
+        uses: addnab/docker-run-action@v3
+        with:
+          image: romt_build:latest
+          run: poetry run nox -s build
+          options: -v ".:${{ github.workspace }}"
+
+      - uses: actions/upload-artifact@v4
+        with:
+          name: dist-ubuntu-latest
+          path: "dist/"