gitlab-ci: add a job to verify the devcontainer in CI

.gitlab-ci.yml

@@ -193,6 +193,16 @@ l:clazy-fedora44:
         - .rules
     needs: []
 
+t:devcontainer-fedora44:
+    extends:
+        - .fedora44
+        - .cmake_test_devcontainer
+        - .linux_x86_64_priv_tags
+        - .rules
+    variables:
+        CMAKE_CI_JOB_NIGHTLY: "true"
+    needs: []
+
 # Coverage builds
 
 b:fedora44-gcc-gcov:

.gitlab/os-linux.yml

@@ -651,6 +651,13 @@
         - docker
         - linux-x86_64
 
+.linux_x86_64_priv_tags:
+    tags:
+        - cmake
+        - docker
+        - linux-x86_64
+        - privileged
+
 .linux_x86_64_v3_tags:
     tags:
         - cmake
@@ -963,3 +970,11 @@
           -DCMake_SPHINX_CMAKE_ORG_OUTDATED=$CMAKE_CI_SPHINX_OUTDATED
           -DCMake_VERSION_NO_GIT=$CMAKE_CI_VERSION_NO_GIT
         - ninja
+
+### Devcontainer testing
+
+.cmake_test_devcontainer:
+    stage: test
+    script:
+        - dnf install -y --setopt=install_weak_deps=False podman
+        - .gitlab/ci/devcontainer-run.sh