Fix build of SNP PR container (#4954)

.github/workflows/build-ci-container.yml

@@ -26,7 +26,7 @@ env:
 
 jobs:
   build:
-    name: "Build and Publish CI Containers"
+    name: "Build and Publish Pre-built SNP Container"
     runs-on: [self-hosted, 1ES.Pool=ccf-ci-github]
     steps:
       - uses: actions/checkout@v3
@@ -47,7 +47,7 @@ jobs:
         run: docker pull $ACR_REGISTRY/ccf/ci:02-02-2023-snp
 
       - name: Build CCF CI SNP container
-        run: docker build -f docker/ccf_ci_built . --build-arg="base=ccfmsrc.azurecr.io/ccf/ci:02-02-2023-snp" --build-arg="platform=snp" -t $ACR_REGISTRY/ccf/ci:pr-`git rev-parse HEAD`
+        run: docker build -f docker/ccf_ci_built . --build-arg="base=ccfmsrc.azurecr.io/ccf/ci:02-02-2023" --build-arg="platform=snp" -t $ACR_REGISTRY/ccf/ci:pr-`git rev-parse HEAD`
 
       - name: Push CI container
         run: docker push $ACR_REGISTRY/ccf/ci:pr-`git rev-parse HEAD`