ci: Enable Sphinx copybutton for cmake.org and Sphinx jobs

.gitlab/ci/configure_sphinx.cmake

@@ -1,6 +1,7 @@
 set(SPHINX_INFO ON CACHE BOOL "")
 set(SPHINX_MAN ON CACHE BOOL "")
 set(SPHINX_HTML ON CACHE BOOL "")
+set(SPHINX_HTML_COPYBUTTON ON CACHE BOOL "")
 set(SPHINX_SINGLEHTML ON CACHE BOOL "")
 set(SPHINX_QTHELP ON CACHE BOOL "")
 set(SPHINX_TEXT ON CACHE BOOL "")

.gitlab/os-linux.yml

@@ -957,6 +957,7 @@
         - cd build/
         - cmake ../Utilities/Sphinx -GNinja
           -DSPHINX_HTML=ON
+          -DSPHINX_HTML_COPYBUTTON=ON
           -DSPHINX_QTHELP=$CMAKE_CI_SPHINX_QTHELP
           -DCMake_SPHINX_CMAKE_ORG=ON
           -DCMake_SPHINX_CMAKE_ORG_OUTDATED=$CMAKE_CI_SPHINX_OUTDATED