Fix(test.sh): use build requirements

setuptools has been bumpend and caused issue with buidling.
Instead of updating setuptools directly in test.sh, use build
requirements with pinned dependencies and gated by CI

This will also ensure testing of requirements-build.txt

To avoid interference with RPM installed deps a virtualenv has been
used.

Signed-off-by: Martin Basti <[email protected]>

test.sh

@@ -48,6 +48,9 @@ function setup_osbs() {
                     cairo-devel gobject-introspection-devel cairo-gobject-devel ostree)
   PKG_EXTRA+=("${PKG_COMMON_EXTRA[@]}")
 
+  python -m venv testenv
+  source "testenv/bin/activate"
+
   PIP_INST=("$PIP" install --index-url "${PYPI_INDEX:-https://pypi.org/simple}")
 
   # RPM install basic dependencies
@@ -59,11 +62,9 @@ function setup_osbs() {
   # Upgrade pip to provide latest features for successful installation
   $RUN "${PIP_INST[@]}" --upgrade "pip<23.1"
 
+  $RUN "${PIP_INST[@]}" -r requirements-build.txt
+
   if [[ $OS == rockylinux ]]; then
-    # Pip install/upgrade setuptools. Older versions of setuptools don't understand
-    # environment markers, also rockylinux needs to have setuptools updates to make
-    # pytest-cov work
-    $RUN "${PIP_INST[@]}" --upgrade setuptools
     # install with RPM_PY_SYS=true to avoid error caused by installing on system python
     $RUN sh -c "RPM_PY_SYS=true ${PIP_INST[*]} rpm-py-installer"
   fi