Upgrade to python 3.12 and use built-in cache feature

https://github.com/actions/setup-python?tab=readme-ov-file#caching-packages-dependencies

.github/actions/prepare-python/action.yml

@@ -13,15 +13,8 @@ runs:
     - name: "Setup python"
       uses: actions/setup-python@v5
       with:
-        python-version: 3.9
-
-    - name: "Check for cached dependencies"
-      uses: actions/cache@v4
-      with:
-        path: ~/.cache/pip
-        key: ${{ runner.os }}-pip-${{ hashFiles('**/requirements.txt') }}
-        restore-keys: |
-          ${{ runner.os }}-pip-
+        python-version: 3.12
+        cache: 'pip'
 
     - name: "Install and upgrade pip"
       shell: bash

.github/workflows/check-todays-snapshot.yml

@@ -41,7 +41,6 @@ jobs:
             packages: "llvm"
 
     runs-on: ubuntu-latest
-    container: fedora:39
     steps:
       - name: Setup Copr config file
         env:
@@ -54,7 +53,7 @@ jobs:
 
       - name: Install Copr CLI
         run: |
-          dnf install -y copr-cli diffutils pcre2-tools jq
+          sudo apt-get install -y lsb-release diffutils pcre2-utils jq
 
       - uses: actions/checkout@v4
 

snapshot_manager/snapshot_manager/build_status.py

@@ -82,9 +82,7 @@ def list(cls):
         return list(map(lambda c: c.value, cls))
 
 
-# TODO(kwk) once it works, add the kw_only argument
-# @dataclasses.dataclass(kw_only=True, order=True)
-@dataclasses.dataclass(order=True)
+@dataclasses.dataclass(kw_only=True, order=True)
 class BuildState:
     """An error describes what and why some package failed to build in a particular chroot."""
 

snapshot_manager/snapshot_manager/config.py

@@ -6,9 +6,7 @@
 import dataclasses
 
 
-# TODO(kwk) once it works, add the kw_only argument
-# @dataclasses.dataclass(kw_only=True)
-@dataclasses.dataclass()
+@dataclasses.dataclass(kw_only=True)
 class Config:
     chroot_pattern: str = r"^fedora-(rawhide|[0-9]+)"
     """Regular expression to select chroots from all chroots currently supported on Copr."""