Test new C-ACI pool

.github/workflows/ci.yml

@@ -150,3 +150,13 @@ jobs:
           # All other acceptably fast tests, which are now supported on Azure Linux.
           ./tests.sh --timeout 360 --output-on-failure -LE "benchmark|suite|unit"
         shell: bash
+
+  build_caci:
+    name: "Experimental C-ACI CI"
+    runs-on: [self-hosted, 1ES.Pool=gha-caci-ne]
+
+    steps:
+      - name: "Steps that run in a C-ACI container, hopefully"
+        run: |
+          ls
+          ls -la /dev/sev

docker/ccf_caci_ci

@@ -0,0 +1,6 @@
+FROM ubuntu:24.04
+ENV DOTNET_SYSTEM_GLOBALIZATION_INVARIANT=1
+RUN apt-get update
+RUN apt-get install -y wget
+RUN apt-get install -y tar
+RUN apt-get install -y dotnet-sdk-8.0