Setup mkosi.cache for GH workflow

.github/workflows/mkosi.yml

@@ -13,14 +13,19 @@ jobs:
   build-and-release:
     runs-on: ubuntu-22.04
     steps:
-      - uses: actions/checkout@f43a0e5ff2bd294095638e18286ca9a3d1956744
+      - uses: actions/checkout@v4
       - run: |
           sudo apt-get install -y --no-install-recommends \
             python3 python3-pip python-is-python3 python3-pyelftools python3-pefile pipx \
             qemu-user-static binfmt-support bubblewrap dosfstools mtools uidmap debian-archive-keyring
       - run: |
           pipx ensurepath
           pipx install git+https://github.com/systemd/mkosi.git@v22
+      - name: Setup mkosi cache
+        uses: actions/cache@v4
+        with:
+          path: mkosi.cache
+          key: ${{ runner.os }}
       - name: Setup mkosi
         run: |
           touch mkosi.key mkosi.crt