gitlab-ci: add jobs to test CMake with external dependencies on Linux

Test that CMake works without its bundled dependencies.
For some dependencies, test using the minimum supported version.
diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index f321d33..bfc713f 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -314,6 +314,33 @@
     variables:
         CMAKE_CI_JOB_NIGHTLY: "true"
 
+b:debian10-extdeps:
+    extends:
+        - .debian10_extdeps
+        - .cmake_build_linux_standalone
+        - .linux_builder_tags
+        - .run_manually
+    variables:
+        CMAKE_CI_JOB_NIGHTLY: "true"
+
+b:debian10-aarch64-extdeps:
+    extends:
+        - .debian10_aarch64_extdeps
+        - .cmake_build_linux_standalone
+        - .linux_builder_tags_aarch64
+        - .run_manually
+    variables:
+        CMAKE_CI_JOB_NIGHTLY: "true"
+
+b:fedora36-extdeps:
+    extends:
+        - .fedora36_extdeps
+        - .cmake_build_linux_standalone
+        - .linux_builder_tags
+        - .run_manually
+    variables:
+        CMAKE_CI_JOB_NIGHTLY: "true"
+
 t:fedora36-ninja:
     extends:
         - .fedora36_ninja