Enable devel testing pipeline (#2337)

Author: ssbarnea

.github/workflows/tox.yml

@@ -1,6 +1,9 @@
 ---
 name: tox
 on:
+  merge_group:
+    branches:
+      - "main"
   push:
     branches:
       - "main"
@@ -37,6 +40,7 @@ jobs:
             lint
             docs
             pkg
+            devel:tox -e devel -- -k test_unit
             py310:tox -e py310 -- -k test_unit
             py311:tox -e py311 -- -k test_unit
             py312:tox -e py312 -- -k test_unit

tox.ini

@@ -15,9 +15,11 @@ skip_missing_interpreters = true
 
 [testenv]
 description =
-    Run the tests under {base_python}
-    devel: and ansible devel branch
+    Run the tests
+    devel: w/ constraints, some devel dependencies
 package = editable
+deps =
+    devel: requests@ git+https://github.com/psf/requests.git
 extras =
     cli
     opt
@@ -65,6 +67,8 @@ set_env =
     UV_CONSTRAINT = {tox_root}/.config/constraints.txt
     deps, devel, hook, lint, pkg, pre, py310, schemas: PIP_CONSTRAINT = /dev/null
     deps, devel, hook, lint, pkg, pre, py310, schemas: UV_CONSTRAINT = /dev/null
+    devel: PIP_PRE = 1
+    devel: UV_PRERELEASE = allow
 commands_pre =
     sh -c "rm -f {env_dir}/.coverage.* 2>/dev/null || true"
     {env_python} -m pip check
@@ -100,7 +104,7 @@ commands =
 
 [testenv:pkg]
 description =
-    Build package, verify metadata, install package and assert behavior when ansible is missing.
+    Build package, verify metadata, install package
 skip_install = true
 deps =
     build>=0.9