Update tox template

Reviewed-by: Goncharov, Artem <artem.goncharov@t-systems.com>
Co-authored-by: gtema <artem.goncharov@gmail.com>
Co-committed-by: gtema <artem.goncharov@gmail.com>

otc_metadata/templates/tox.ini.j2

@@ -21,8 +21,14 @@ deps =
   -r{toxinidir}/requirements.txt
 commands = {posargs}
 
+# This env is invoked in the periodic pipeline and is therefore responsible to
+# build all relevant docs at once.
 [testenv:docs]
 deps = -r{toxinidir}/doc/requirements.txt
+allowlist_externals =
+  mkdir
+  cp
+  sh
 commands =
 {%- for doc in docs %}
   {[testenv:{{ doc.type }}]commands}
@@ -32,7 +38,11 @@ commands =
 [testenv:docs-pdf]
 deps = -r{toxinidir}/doc/requirements.txt
 allowlist_externals =
+  rm
   mkdir
+  make
+  bash
+  cp
 commands =
   mkdir -p doc/build/pdf
 {%- for doc in docs %}
@@ -68,11 +78,12 @@ deps = -r{toxinidir}/doc/requirements.txt
 allowlist_externals =
   cp
   mkdir
-  find
+  sh
 commands =
   sphinx-build -W --keep-going -b json {{ loc }}/source doc/build/json/{{ doc.type }}
-  # Drop data useless for the search
-  find doc/build/json -type d -and ( -name '_images' -or -name '_static' -or -name '_sources' ) -exec rm {:} ;
+  # Drop data useless for the search - wrap it also with sh/xargs due to bugs
+  # in tox
+  sh -c "find doc/build/json -type d -and '(' -name '_images' -or -name '_static' -or -name '_sources' ')' -print0 | xargs -0 rm -rf"
 {%- if doc.type == 'api-ref' %}
   mkdir -p api-ref/build/json
   cp -av doc/build/json/api-ref api-ref/build/json