Fix package manager for UBI8 Python container (#85)

Use dnf instead of microdnf for ubi8/python-312 container

Author: jblang

.github/workflows/pythonrelease.yml

@@ -57,7 +57,7 @@ jobs:
       if: matrix.build == 'linux'
       shell: bash
       run: |
-        microdnf install -y make p7zip p7zip-plugins
+        dnf install -y make p7zip p7zip-plugins
         python -m pip install --upgrade pip
         if [ -f requirements_dev.txt ]; then pip install -r requirements_dev.txt; fi
     - name: Set up Python (Windows/Mac)

.gitignore

@@ -34,3 +34,4 @@ sperf.spec
 sperf.build
 
 .vagrant
+.venv/