workflow: tox improvements

- Run test environments in parallel
- Build wheel packages rather than sdists for test environments
- Skip the install step when running `tox -e pkg`

.github/workflows/lsp-pr.yml

@@ -48,7 +48,7 @@ jobs:
         cd lib/esbonio
 
         version=$(echo ${{ matrix.python-version }} | tr -d .)
-        python -m tox -e `tox -l | grep $version | tr '\n' ','`
+        python -m tox run-parallel --parallel-no-spinner -e `tox -l | grep $version | tr '\n' ','`
       shell: bash
       name: Run Tests
 

lib/esbonio/pyproject.toml

@@ -121,6 +121,8 @@ skip_missing_interpreters = true
 envlist = py{38,39,310,311}-sphinx{5,6,7}
 
 [testenv]
+package = wheel
+wheel_build_env = .pkg
 deps =
     sphinx5: sphinx>=5,<6
 
@@ -137,7 +139,7 @@ commands =
 [testenv:pkg]
 deps =
     build
-usedevelop = True
+skip_install = True
 commands =
     python -m build
 """