docs: gh-pages update by tox

tox.ini

@@ -45,20 +45,27 @@ description = Build sphinx documentation
 platform = darwin
 basepython = python3.11
 passenv = SAPNWRFC_HOME
+change_dir = doc
 allowlist_externals =
     sphinx-build
+deps = sphinx
+commands =
+    sphinx-build -b html -a -E -d {envtmpdir}/doctrees . {envtmpdir}/html
+
+[testenv:gh-pages]
+description = Build gh-pages
+platform = darwin
+basepython = python3.11
+skip_install = true
+allowlist_externals =
     git
     rm
     cp
-    cd
 deps = sphinx
 commands =
-    cd doc
-    sphinx-build -b html -a -E -d {envtmpdir}/doctrees . {envtmpdir}/html
     git checkout gh-pages
-    cd {toxinidir}
     rm -rf *.html searchindex.js objects.inv _images _sources _static
-    cp -R {envtmpdir}/html/. .
+    cp -R {envtmpdir}/docs/tmp/html/. .
     git add .
     git commit -m "gh-pages update by tox"
     git checkout main